1
|
Khatir ZZ, Di Sotto A, Percaccio E, Tuylu Kucukkilinc T, Ercan A, Chippindale AM, Valipour M, Irannejad H. 4-{3-[(Pyridin-4-ylmethyl)amino]-[1,2,4]triazolo[4,3-b][1,2,4]triazin-6-yl}phenol: An improved anticancer agent in hepatocellular carcinoma and a selective MDR1/MRP modulator. Arch Pharm (Weinheim) 2024:e2300704. [PMID: 38442326 DOI: 10.1002/ardp.202300704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2023] [Revised: 02/02/2024] [Accepted: 02/08/2024] [Indexed: 03/07/2024]
Abstract
Hepatocellular carcinoma is the most common type of primary liver cancer. However, multidrug resistance (MDR) is a major obstacle to the effective chemotherapy of cancer cells. This report documents the rational design, synthesis, and biological evaluation of a novel series of triazolotriazines substituted with CH2 NH-linked pyridine for use as dual c-Met/MDR inhibitors. Compound 12g with IC50 of 3.06 μM on HepG2 cells showed more potency than crizotinib (IC50 = 5.15 μM) in the MTT assay. In addition, 12g inhibited c-Met kinase at a low micromolar level (IC50 = 0.052 μM). 12g significantly inhibited P-gp and MRP1/2 efflux pumps in both cancerous HepG2 and BxPC3 cells starting from the lower concentrations of 3 and 0.3 µM, respectively. 12g did not inhibit MDR1 and MRP1/2 in noncancerous H69 cholangiocytes up to the concentration of 30 and 60 µM, respectively. Current results highlighted that cancerous cells were more susceptible to the effect of 12g than normal cells, in which the inhibition occurred only at the highest concentrations, suggesting a further interest in 12g as a selective anticancer agent. Overall, 12g, as a dual c-Met and P-gp/MRP inhibitor, is a promising lead compound for developing a new generation of anticancer agents.
Collapse
Affiliation(s)
- Zahra Zakeri Khatir
- Department of Medicinal Chemistry, Faculty of Pharmacy, Mazandaran University of Medical Sciences, Sari, Iran
| | - Antonella Di Sotto
- Department of Physiology and Pharmacology "V. Erspamer", Sapienza University of Rome, Rome, Italy
| | - Ester Percaccio
- Department of Physiology and Pharmacology "V. Erspamer", Sapienza University of Rome, Rome, Italy
| | - Tuba Tuylu Kucukkilinc
- Department of Biochemistry, Faculty of Pharmacy, Hacettepe University, Sihhiye, Ankara, Turkey
| | - Ayse Ercan
- Department of Biochemistry, Faculty of Pharmacy, Hacettepe University, Sihhiye, Ankara, Turkey
| | | | - Mehdi Valipour
- Razi Drug Research Center, Iran University of Medical Sciences, Tehran, Iran
| | - Hamid Irannejad
- Department of Medicinal Chemistry, Faculty of Pharmacy, Mazandaran University of Medical Sciences, Sari, Iran
| |
Collapse
|
2
|
Kearney L, Brandon MP, Coleman A, Chippindale AM, Hartl F, Lalrempuia R, Pižl M, Pryce MT. Ligand-Structure Effects on N-Heterocyclic Carbene Rhenium Photo- and Electrocatalysts of CO 2 Reduction. Molecules 2023; 28:molecules28104149. [PMID: 37241890 DOI: 10.3390/molecules28104149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 04/20/2023] [Accepted: 05/13/2023] [Indexed: 05/28/2023] Open
Abstract
Three novel rhenium N-heterocyclic carbene complexes, [Re]-NHC-1-3 ([Re] = fac-Re(CO)3Br), were synthesized and characterized using a range of spectroscopic techniques. Photophysical, electrochemical and spectroelectrochemical studies were carried out to probe the properties of these organometallic compounds. Re-NHC-1 and Re-NHC-2 bear a phenanthrene backbone on an imidazole (NHC) ring, coordinating to Re by both the carbene C and a pyridyl group attached to one of the imidazole nitrogen atoms. Re-NHC-2 differs from Re-NHC-1 by replacing N-H with an N-benzyl group as the second substituent on imidazole. The replacement of the phenanthrene backbone in Re-NHC-2 with the larger pyrene gives Re-NHC-3. The two-electron electrochemical reductions of Re-NHC-2 and Re-NHC-3 result in the formation of the five-coordinate anions that are capable of electrocatalytic CO2 reduction. These catalysts are formed first at the initial cathodic wave R1, and then, ultimately, via the reduction of Re-Re bound dimer intermediates at the second cathodic wave R2. All three Re-NHC-1-3 complexes are active photocatalysts for the transformation of CO2 to CO, with the most photostable complex, Re-NHC-3, being the most effective for this conversion. Re-NHC-1 and Re-NHC-2 afforded modest CO turnover numbers (TONs), following irradiation at 355 nm, but were inactive at the longer irradiation wavelength of 470 nm. In contrast, Re-NHC-3, when photoexcited at 470 nm, yielded the highest TON in this study, but remained inactive at 355 nm. The luminescence spectrum of Re-NHC-3 is red-shifted compared to those of Re-NHC-1 and Re-NHC-2, and previously reported similar [Re]-NHC complexes. This observation, together with TD-DFT calculations, suggests that the nature of the lowest-energy optical excitation for Re-NHC-3 has π→π*(NHC-pyrene) and dπ(Re)→π*(pyridine) (IL/MLCT) character. The stability and superior photocatalytic performance of Re-NHC-3 are attributed to the extended conjugation of the π-electron system, leading to the beneficial modulation of the strongly electron-donating tendency of the NHC group.
Collapse
Affiliation(s)
- Lauren Kearney
- School of Chemical Sciences, Dublin City University, D09 K20V Dublin, Ireland
| | - Michael P Brandon
- School of Chemical Sciences, Dublin City University, D09 K20V Dublin, Ireland
| | - Andrew Coleman
- School of Chemical Sciences, Dublin City University, D09 K20V Dublin, Ireland
| | - Ann M Chippindale
- Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6DX, UK
| | - František Hartl
- Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6DX, UK
| | - Ralte Lalrempuia
- School of Chemical Sciences, Dublin City University, D09 K20V Dublin, Ireland
- Department of Chemistry, School of Physical Sciences, Mizoram University, Aizawl 796004, India
| | - Martin Pižl
- Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, 16628 Prague, Czech Republic
| | - Mary T Pryce
- School of Chemical Sciences, Dublin City University, D09 K20V Dublin, Ireland
| |
Collapse
|
3
|
ODonnell AD, Gavriel AG, Christie W, Chippindale AM, German IM, Hayes W. Conformational control of bis-urea self-assembled supramolecular pH switchable low-molecular-weight hydrogelators. ARKIVOC 2021. [DOI: 10.24820/ark.5550190.p011.581] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
|
4
|
Gavriel AG, Leroux F, Khurana GS, Lewis VG, Chippindale AM, Sambrook MR, Hayes W, Russell AT. Self-Immolative System for Disclosure of Reactive Electrophilic Alkylating Agents: Understanding the Role of the Reporter Group. J Org Chem 2021; 86:10263-10279. [PMID: 34292742 PMCID: PMC8389931 DOI: 10.1021/acs.joc.1c00996] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
The development of
stable, efficient chemoselective self-immolative
systems, for use in applications such as sensors, requires the optimization
of the reactivity and degradation characteristics of the self-immolative
unit. In this paper, we describe the effect that the structure of
the reporter group has upon the self-immolative efficacy of a prototype
system designed for the disclosure of electrophilic alkylating agents.
The amine of the reporter group (a nitroaniline unit) was a constituent
part of a carbamate that functioned as the self-immolative unit. The
number and position of substituents on the nitroaniline unit were
found to play a key role in the rate of self-immolative degradation
and release of the reporter group. The position of the nitro substituent
(meta- vs para-) and the methyl
groups in the ortho-position relative to the carbamate
exhibited an influence on the rate of elimination and stability of
the self-immolative system. The ortho-methyl substituents
imparted a twist on the N–C (aromatic) bond leading to increased
resonance of the amine nitrogen’s lone pair into the carbonyl
moiety and a decrease of the leaving character of the carbamate group;
concomitantly, this may also make it a less electron-withdrawing group
and lead to less acidification of the eliminated β-hydrogen.
Collapse
Affiliation(s)
- Alexander G Gavriel
- Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, U.K
| | - Flavien Leroux
- Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, U.K
| | - Gurjeet S Khurana
- Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, U.K
| | - Viliyana G Lewis
- Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, U.K
| | - Ann M Chippindale
- Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, U.K
| | - Mark R Sambrook
- CBR Division, Defence Science & Technology Laboratory (Dstl), Porton Down, Salisbury, Wiltshire SP4 0JQ, U.K
| | - Wayne Hayes
- Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, U.K
| | - Andrew T Russell
- Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, U.K
| |
Collapse
|
5
|
Valipour M, Chippindale AM, Kouzeli A, Irannejad H. A new and facile synthesis of N-benzyl-N′-acylureas via reaction of dibenzoylhydrazine carboxamide and benzylamines. SYNTHETIC COMMUN 2021. [DOI: 10.1080/00397911.2021.1960376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Mehdi Valipour
- Department of Medicinal Chemistry, Faculty of Pharmacy, Mazandaran University of Medical Sciences, Sari, Iran
| | - Ann M. Chippindale
- Department of Chemistry, University of Reading, Whiteknights, Reading, Berks, UK
| | - Aynaz Kouzeli
- Department of Medicinal Chemistry, Faculty of Pharmacy, Mazandaran University of Medical Sciences, Sari, Iran
| | - Hamid Irannejad
- Department of Medicinal Chemistry, Faculty of Pharmacy, Mazandaran University of Medical Sciences, Sari, Iran
| |
Collapse
|
6
|
Taylor J, Culpeck R, Chippindale AM, Calhorda MJ, Hartl F. Effect of the 2-R-Allyl and Chloride Ligands on the Cathodic Paths of [Mo(η 3-2-R-allyl)(α-diimine)(CO) 2Cl] (R = H, CH 3; α-diimine = 6,6'-Dimethyl-2,2'-bipyridine, Bis( p-tolylimino)acenaphthene). Organometallics 2021; 40:1598-1613. [PMID: 34295012 PMCID: PMC8289335 DOI: 10.1021/acs.organomet.1c00038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Indexed: 11/28/2022]
Abstract
The new, formally Mo(II) complexes [Mo(η3-2-R-allyl)(6,6'-dmbipy)(CO)2Cl] (6,6'-dmbipy = 6,6'-dimethyl-2,2'-bipyridine; 2-R-allyl = allyl for R = H, 2-methallyl for R = CH3) and [Mo(η3-2-methallyl)(pTol-bian)(CO)2Cl] (pTol-bian = bis(p-tolylimino)acenaphthene) share, in this rare case, the same structural type. The effect of the anionic π-donor ligand X (Cl- vs NCS-) and the 2-R-allyl substituents on the cathodic behavior was explored. Both ligands play a significant role at all stages of the reduction path. While 2e--reduced [Mo(η3-allyl)(6,6'-dmbipy)(CO)2]- is inert when it is ECE-generated from [Mo(η3-allyl)(6,6'-dmbipy)(CO)2(NCS)], the Cl- ligand promotes Mo-Mo dimerization by facilitating the nucleophilic attack of [Mo(η3-allyl)(6,6'-dmbipy)(CO)2]- at the parent complex at ambient temperature. The replacement of the allyl ligand by 2-methallyl has a similar effect. The Cl-/2-methallyl ligand assembly destabilizes even primary radical anions of the complex containing the strongly π-accepting pTol-Bian ligand. Under argon, the cathodic paths of [Mo(η3-2-R-allyl)(6,6'-dmbipy)(CO)2Cl] terminate at ambient temperature with 5-coordinate [Mo(6,6'-dmbipy)(CO)3]2- instead of [Mo(η3-2-R-allyl)(6,6'-dmbipy)(CO)2]-, which is stabilized in chilled electrolyte. [Mo(η3-allyl)(6,6'-dmbipy)(CO)2]- catalyzes CO2 reduction only when it is generated at the second cathodic wave of the parent complex, while [Mo(η3-2-methallyl)(6,6'-dmbipy)(CO)2]- is already moderately active at the first cathodic wave. This behavior is fully consistent with absent dimerization under argon on the cyclic voltammetric time scale. The electrocatalytic generation of CO and formate is hampered by the irreversible formation of anionic tricarbonyl complexes replacing reactive [Mo(η3-2-methallyl)(6,6'-dmbipy)(CO)2]2 along the cathodic route.
Collapse
Affiliation(s)
- James
O. Taylor
- Department
of Chemistry, University of Reading, Reading RG6 6DX, United Kingdom
| | - Ryan Culpeck
- Department
of Chemistry, University of Reading, Reading RG6 6DX, United Kingdom
| | - Ann M. Chippindale
- Department
of Chemistry, University of Reading, Reading RG6 6DX, United Kingdom
| | - Maria José Calhorda
- BioISI-Biosystems
& Integrative Sciences Institute, Departamento de Química
e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisbon, Portugal
| | - František Hartl
- Department
of Chemistry, University of Reading, Reading RG6 6DX, United Kingdom
| |
Collapse
|
7
|
Abstract
![]()
Hybrid
bismuth-containing halides are emerging as alternative candidates
to lead-containing perovskites for light-harvesting applications,
as Bi3+ is isoelectronic with Pb2+ and the presence of an active lone pair of electrons
is expected to result in outstanding charge-carrier transport properties.
Here, we report a family of one binary and three ternary iodobismuthates
containing 1,4-diazabicyclo[2.2.2]octane (DABCO). These materials
have been prepared solvothermally and their crystal structures, thermal
stability, and optical properties determined. Reactions carried out
in the presence of bismuth iodide and DABCO produced (C6H12N2)BiI3 (1), which
consists of hybrid ribbons in which pairs of edge-sharing bismuth
octahedra are linked by DABCO ligands. Short I···I
contacts give rise to a three-dimensional network. Similar reactions
in the presence of copper iodide produced (C8H17N2)2Bi2Cu2I10(2) and [(C6H13N2)2BiCu2I7](C2H5OH) (3) in which either ethylated DABCO cations (EtDABCO)+ or monoprotonated DABCO cations (DABCOH)+ are
coordinated to copper in discrete tetranuclear and trinuclear clusters,
respectively. In the presence of potassium iodide, a unique three-dimensional
framework, (C6H14N2)[(C6H12N2)KBiI6] (4), was
formed, which contains one-dimensional hexagonal channels approximately
6 Å in diameter. The optical band gaps of these materials, which
are semiconductors, range between 1.82 and 2.27 eV, with the lowest
values found for the copper-containing discrete clusters. Preliminary
results on the preparation of thin films are presented. The solvothermal syntheses, crystal structures, and optical
properties of four new iodobismuthates containing 1,4-diazabicyclo[2.2.2]octane
(DABCO) are described. In the absence of hydriodic acid, DABCO can
act as a ligand instead of acting as a countercation.
Collapse
Affiliation(s)
- Yunhe Cai
- Department of Chemistry, University of Reading, Whiteknights, Reading, Berkshire RG6 6DX, United Kingdom
| | - Ann M Chippindale
- Department of Chemistry, University of Reading, Whiteknights, Reading, Berkshire RG6 6DX, United Kingdom
| | - Richard J Curry
- Photon Science Institute, Department of Electrical and Electronic Engineering, University of Manchester, Manchester, M13 9PL, United Kingdom
| | - Paz Vaqueiro
- Department of Chemistry, University of Reading, Whiteknights, Reading, Berkshire RG6 6DX, United Kingdom
| |
Collapse
|
8
|
Hibble SJ, Chippindale AM, Zbiri M, Rees NH, Keeble DS, Wilhelm H, d’Ambrumenil S, Seifert D. Intra- and Interchain Interactions in (Cu 1/2Au 1/2)CN, (Ag 1/2Au 1/2)CN, and (Cu 1/3Ag 1/3Au 1/3)CN and Their Effect on One-, Two-, and Three-Dimensional Order. Inorg Chem 2020; 59:11704-11714. [PMID: 32799476 PMCID: PMC7458429 DOI: 10.1021/acs.inorgchem.0c01593] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Indexed: 11/28/2022]
Abstract
Mixed-metal cyanides (Cu1/2Au1/2)CN, (Ag1/2Au1/2)CN, and (Cu1/3Ag1/3Au1/3)CN adopt an AuCN-type structure in which metal-cyanide chains pack on a hexagonal lattice with metal atoms arranged in sheets. The interactions between and within the metal-cyanide chains are investigated using density functional theory (DFT) calculations, 13C solid-state NMR (SSNMR), and X-ray pair distribution function (PDF) measurements. Long-range metal and cyanide order is found within the chains: (-Cu-NC-Au-CN-)∞, (-Ag-NC-Au-CN-)∞, and (-Cu-NC-Ag-NC-Au-CN-)∞. Although Bragg diffraction studies establish that there is no long-range order between chains, X-ray PDF results show that there is local order between chains. In (Cu1/2Au1/2)CN and (Ag1/2Au1/2)CN, there is a preference for unlike metal atoms occurring as nearest neighbors within the metal sheets. A general mathematical proof shows that the maximum average number of heterometallic nearest-neighbor interactions on a hexagonal lattice with two types of metal atoms is four. Calculated energies of periodic structural models show that those with four unlike nearest neighbors are most favorable. Of these, models in space group Immm give the best fits to the X-ray PDF data out to 8 Å, providing good descriptions of the short- and medium-range structures. This result shows that interactions beyond those of nearest neighbors must be considered when determining the structures of these materials. Such interactions are also important in (Cu1/3Ag1/3Au1/3)CN, leading to the adoption of a structure in Pmm2 containing mixed Cu-Au and Ag-only sheets arranged to maximize the numbers of Cu···Au nearest- and next-nearest-neighbor interactions.
Collapse
Affiliation(s)
- Simon J. Hibble
- Chemistry
Teaching Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3PS, United Kingdom
| | - Ann M. Chippindale
- Department
of Chemistry, University of Reading, Whiteknights Campus, Reading RG6 6AD, United Kingdom
| | - Mohamed Zbiri
- Institut
Laue-Langevin (IIL), 71 avenue des Martyrs, Grenoble Cedex 9 38042, France
| | - Nicholas H. Rees
- Department
of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, United
Kingdom
| | - Dean S. Keeble
- Diamond
Light Source, Harwell Campus, Oxfordshire OX11 0DE, United Kingdom
| | - Heribert Wilhelm
- Diamond
Light Source, Harwell Campus, Oxfordshire OX11 0DE, United Kingdom
| | - Stella d’Ambrumenil
- Department
of Chemistry, University of Reading, Whiteknights Campus, Reading RG6 6AD, United Kingdom
- Institut
Laue-Langevin (IIL), 71 avenue des Martyrs, Grenoble Cedex 9 38042, France
| | - David Seifert
- School of
Mathematics, Statistics and Physics, Newcastle
University, Herschel Building, Newcastle upon Tyne NE1 7RU, United Kingdom
| |
Collapse
|
9
|
Castelletto V, Chippindale AM, Hamley IW, Barnett S, Hasan A, Lau KHA. Crystallization and lamellar nanosheet formation of an aromatic dipeptoid. Chem Commun (Camb) 2019; 55:5867-5869. [DOI: 10.1039/c9cc02335f] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An aromatic peptoid analogue of the diphenylalanine dipeptide self-assembles in aqueous solution and the first crystal structure was obtained for this class of compound.
Collapse
Affiliation(s)
| | | | - Ian W. Hamley
- Department of Chemistry
- University of Reading
- Reading RG6 6AD
- UK
| | - Sarah Barnett
- Diamond Light Source
- Harwell Science and Innovation Campus
- Didcot
- UK
| | - Abshar Hasan
- WestCHEM/Department of Pure & Applied Chemistry
- University of Strathclyde
- Glasgow
- UK
| | - King Hang Aaron Lau
- WestCHEM/Department of Pure & Applied Chemistry
- University of Strathclyde
- Glasgow
- UK
| |
Collapse
|
10
|
Taylor JO, Veenstra FLP, Chippindale AM, Calhorda MJ, Hartl F. Group 6 Metal Complexes as Electrocatalysts of CO2 Reduction: Strong Substituent Control of the Reduction Path of [Mo(η3-allyl)(CO)2(x,x′-dimethyl-2,2′-bipyridine)(NCS)] (x = 4–6). Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00676] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- James O. Taylor
- Department of Chemistry, University of Reading, Reading, RG6 6AD, United Kingdom
| | - Florentine L. P. Veenstra
- Department of Chemistry, University of Reading, Reading, RG6 6AD, United Kingdom
- Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Hönggerberg, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland
| | - Ann M. Chippindale
- Department of Chemistry, University of Reading, Reading, RG6 6AD, United Kingdom
| | - Maria José Calhorda
- Centro de Química e Bioquímica and BioISI - Biosystems & Integrative Sciences Institute, Departamento de Quı́mica e Bioquı́mica, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
| | - František Hartl
- Department of Chemistry, University of Reading, Reading, RG6 6AD, United Kingdom
| |
Collapse
|
11
|
Chen L, Lim KJC, Babra TS, Taylor JO, PiŽl M, Evans R, Chippindale AM, Hartl F, Colquhoun HM, Greenland BW. A macrocyclic receptor containing two viologen species connected by conjugated terphenyl groups. Org Biomol Chem 2018; 16:5006-5015. [PMID: 29946600 DOI: 10.1039/c8ob00919h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A macrocyclic receptor molecule containing two viologen species connected by conjugated terphenyl groups has been designed and synthesised. The single-crystal X-ray structure shows that the two viologen residues have a transannular NN separation of ca. 7.4 Å. Thus, the internal cavity dimensions are suitable for the inclusion of π-electron-rich species. The macrocycle is redox active, and can accept electrons from suitable donor species including triethylamine, resulting in a dramatic colour change from pale yellow to dark green as a consequence of the formation of a paramagnetic bis(radical cationic) species. Cyclic voltammetry shows that the macrocycle can undergo two sequential and reversible reduction processes (E1/2 = -0.65 and -0.97 V vs. Fc/Fc+). DFT and TD-DFT studies accurately replicate the structure of the tetracationic macrocycle and the electronic absorption spectra of the three major redox states of the system. These calculations also showed that during electrochemical reduction, the unpaired electron density of the radical cations remained relatively localised within the heterocyclic rings. The ability of the macrocycle to form supramolecular complexes was confirmed by the formation of a pseudorotaxane with a guest molecule containing a π-electron-rich 1,5-dihydroxynaphthalene derivative. Threading and dethreading of the pseudorotaxane was fast on the NMR timescale, and the complex exhibited an association constant of 150 M-1 (±30 M-1) as calculated from 1H NMR titration studies.
Collapse
Affiliation(s)
- Long Chen
- Department of Chemistry, University of Reading, Whiteknights, Reading, RG6 6AD, UK.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
12
|
Hosseini Balef SS, Chippindale AM, Irannejad H. A crystallographic and theoretical study of an (E)-2-Hydroxyiminoethanone derivative: prediction of cyclooxygenase inhibition selectivity of stilbenoids by MM-PBSA and the role of atomic charge. J Biomol Struct Dyn 2018; 37:1555-1566. [PMID: 29697018 DOI: 10.1080/07391102.2018.1462256] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
We recently reported that the hydroxyiminoethanone derivative, (E)-OXM, behaves as a highly selective COX-1 inhibitor (COX-1 SI = 833), and also an interesting scaffold with unique characteristics. In the current study, a comprehensive crystallographic and computational study was performed to elucidate its conformational stability and pharmacological activity. Its conformational energy was studied at the B3LYP/6-311G** level of theory and compared to the single-crystal X-ray diffraction data. In addition, computational studies of three structurally different stilbenoid derivatives used as selective COX-1 or COX-2 inhibitors were undertaken to predict their COX selectivity potentials. Flexible docking was performed for all compounds at the active site of both COX-1 and COX-2 enzymes by considering some of the key residues as flexible during the docking operation. In the next step, molecular dynamic simulation and binding free energy calculations were performed by MM-PBSA. Final results were found to be highly dependent on the atomic charges of the inhibitors and the choice of force field used to calculate the atomic charges. The binding conformation of the hydroxyiminoethanone derivative is highly correlated with the type of COX isoform inhibited. Our predictive approach can truly predict the cyclooxygenase inhibition selectivity of stilbenoid inhibitors.
Collapse
Affiliation(s)
- Seyed Sajad Hosseini Balef
- a Department of Medicinal Chemistry, Faculty of Pharmacy , Mazandaran University of Medical Sciences , Sari , Iran
| | - Ann M Chippindale
- b Department of Chemistry , University of Reading , Whiteknights, Reading, Berks RG6 6AD, Reading , UK
| | - Hamid Irannejad
- a Department of Medicinal Chemistry, Faculty of Pharmacy , Mazandaran University of Medical Sciences , Sari , Iran
| |
Collapse
|
13
|
Baker BC, German IM, Chippindale AM, McEwan CE, Stevens GC, Colquhoun HM, Hayes W. Nitroarylurea-terminated supramolecular polymers that exhibit facile thermal repair and aqueous swelling-induced sealing of defects. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.02.029] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
14
|
Lees RJE, Powell AV, Chippindale AM. Transition-Metal Linkage of Antimony-Sulfide Chains in [M(dien)2]{Sb18S30[M(dien)]2} (M= Mn, Fe, Co). Z Anorg Allg Chem 2016. [DOI: 10.1002/zaac.201600376] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Rachel J. E. Lees
- Department of Chemistry; Heriot-Watt University; EH14 4AS Edinburgh UK
| | - Anthony V. Powell
- Department of Chemistry; University of Reading; Whiteknights RG6 6AD Reading UK
| | - Ann M. Chippindale
- Department of Chemistry; University of Reading; Whiteknights RG6 6AD Reading UK
| |
Collapse
|
15
|
Lampkin JD, Powell AV, Chippindale AM. Solvothermal synthesis of a new 3-D mixed-metal sulfide framework, (H1.33tren)[In2.67Sb1.33S8]·tren. J SOLID STATE CHEM 2016. [DOI: 10.1016/j.jssc.2016.08.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
16
|
Feula A, Tang X, Giannakopoulos I, Chippindale AM, Hamley IW, Greco F, Paul Buckley C, Siviour CR, Hayes W. An adhesive elastomeric supramolecular polyurethane healable at body temperature. Chem Sci 2016; 7:4291-4300. [PMID: 30090288 PMCID: PMC6054028 DOI: 10.1039/c5sc04864h] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Accepted: 03/14/2016] [Indexed: 01/23/2023] Open
Abstract
In this paper, we report the synthesis and healing ability of a non-cytotoxic supramolecular polyurethane network whose mechanical properties can be recovered efficiently (>99%) at the temperature of the human body (37 °C). Rheological analysis revealed an acceleration in the drop of the storage modulus above 37 °C, on account of the dissociation of the supramolecular polyurethane network, and this decrease in viscosity enables the efficient recovery of the mechanical properties. Microscopic and mechanical characterisation has shown that this material is able to recover mechanical properties across a damage site with minimal contact required between the interfaces and also demonstrated that the mechanical properties improved when compared to other low temperature healing elastomers or gel-like materials. The supramolecular polyurethane was found to be non-toxic in a cytotoxicity assay carried out in human skin fibroblasts (cell viability > 94% and non-significantly different compared to the untreated control). This supramolecular network material also exhibited excellent adhesion to pig skin and could be healed completely in situ post damage indicating that biomedical applications could be targeted, such as artificial skin or wound dressings with supramolecular materials of this type.
Collapse
Affiliation(s)
- Antonio Feula
- Department of Chemistry , University of Reading , Whiteknights , Reading , RG6 6AD , UK .
| | - Xuegang Tang
- Department of Engineering Science , Oxford University , Parks Road , Oxford , OX1 3PJ , UK
| | - Ioannis Giannakopoulos
- Department of Engineering Science , Oxford University , Parks Road , Oxford , OX1 3PJ , UK
| | - Ann M Chippindale
- Department of Chemistry , University of Reading , Whiteknights , Reading , RG6 6AD , UK .
| | - Ian W Hamley
- Department of Chemistry , University of Reading , Whiteknights , Reading , RG6 6AD , UK .
| | - Francesca Greco
- Reading School of Pharmacy , University of Reading , Whiteknights , Reading , RG6 6AD , UK
| | - C Paul Buckley
- Department of Engineering Science , Oxford University , Parks Road , Oxford , OX1 3PJ , UK
| | - Clive R Siviour
- Department of Engineering Science , Oxford University , Parks Road , Oxford , OX1 3PJ , UK
| | - Wayne Hayes
- Department of Chemistry , University of Reading , Whiteknights , Reading , RG6 6AD , UK .
| |
Collapse
|
17
|
Mishra SK, Mittal R, Zbiri M, Rao R, Goel P, Hibble SJ, Chippindale AM, Hansen T, Schober H, Chaplot SL. New insights into the compressibility and high-pressure stability of Ni(CN)2: a combined study of neutron diffraction, Raman spectroscopy, and inelastic neutron scattering. J Phys Condens Matter 2016; 28:045402. [PMID: 26751175 DOI: 10.1088/0953-8984/28/4/045402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Nickel cyanide is a layered material showing markedly anisotropic behaviour. High-pressure neutron diffraction measurements show that at pressures up to 20.1 kbar, compressibility is much higher in the direction perpendicular to the layers, c, than in the plane of the strongly chemically bonded metal-cyanide sheets. Detailed examination of the behaviour of the tetragonal lattice parameters, a and c, as a function of pressure reveal regions in which large changes in slope occur, for example, in c(P) at 1 kbar. The experimental pressure dependence of the volume data is fitted to a bulk modulus, B0, of 1050 (20) kbar over the pressure range 0-1 kbar, and to 124 (2) kbar over the range 1-20.1 kbar. Raman spectroscopy measurements yield additional information on how the structure and bonding in the Ni(CN)2 layers change with pressure and show that a phase change occurs at about 1 kbar. The new high-pressure phase, (Phase PII), has ordered cyanide groups with sheets of D4h symmetry containing Ni(CN)4 and Ni(NC)4 groups. The Raman spectrum of phase PII closely resembles that of the related layered compound, Cu1/2Ni1/2(CN)2, which has previously been shown to contain ordered C≡N groups. The phase change, PI to PII, is also observed in inelastic neutron scattering studies which show significant changes occurring in the phonon spectra as the pressure is raised from 0.3 to 1.5 kbar. These changes reflect the large reduction in the interlayer spacing which occurs as Phase PI transforms to Phase PII and the consequent increase in difficulty for out-of-plane atomic motions. Unlike other cyanide materials e.g. Zn(CN)2 and Ag3Co(CN)6, which show an amorphization and/or a decomposition at much lower pressures (~100 kbar), Ni(CN)2 can be recovered after pressurising to 200 kbar, albeit in a more ordered form.
Collapse
Affiliation(s)
- Sanjay K Mishra
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | | | | | | | | | | | | | | | | | | |
Collapse
|
18
|
Hibble SJ, Chippindale AM, Marelli E, Kroeker S, Michaelis VK, Greer BJ, Aguiar PM, Bilbé EJ, Barney ER, Hannon AC. Local and Average Structure in Zinc Cyanide: Toward an Understanding of the Atomistic Origin of Negative Thermal Expansion. J Am Chem Soc 2013; 135:16478-89. [DOI: 10.1021/ja406848s] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Simon J. Hibble
- Department
of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, United Kingdom
| | - Ann M. Chippindale
- Department
of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, United Kingdom
| | - Elena Marelli
- Department
of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, United Kingdom
| | - Scott Kroeker
- Department
of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | | | - Brandon J. Greer
- Department
of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - Pedro M. Aguiar
- Department
of Chemistry, University of York, York YO10 5DD, United Kingdom
| | - Edward J. Bilbé
- Department
of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, United Kingdom
| | - Emma R. Barney
- ISIS
Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, United Kingdom
| | - Alex C. Hannon
- ISIS
Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, United Kingdom
| |
Collapse
|
19
|
Chippindale AM, Hibble SJ, Marelli E. CuNi(CN)4: a two-dimensional cyanide framework containing CuIIin a square-planar environment. Acta Crystallogr A 2013. [DOI: 10.1107/s0108767313095081] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
20
|
Chippindale AM, Hibble SJ, Bilbé EJ, Marelli E, Hannon AC, Allain C, Pansu R, Hartl F. Mixed Copper, Silver, and Gold Cyanides, (MxM′1–x)CN: Tailoring Chain Structures To Influence Physical Properties. J Am Chem Soc 2012; 134:16387-400. [DOI: 10.1021/ja307087d] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ann M. Chippindale
- Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD,
U.K
| | - Simon J. Hibble
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon
OX11 0QX, U.K
| | - Edward J. Bilbé
- Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD,
U.K
| | - Elena Marelli
- Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD,
U.K
| | - Alex C. Hannon
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon
OX11 0QX, U.K
| | - Clémence Allain
- PPSM, CNRS
UMR 8531, Ecole Normale Supérieure de Cachan, 61, avenue
du President Wilson, 94235 Cachan, France
| | - Robert Pansu
- PPSM, CNRS
UMR 8531, Ecole Normale Supérieure de Cachan, 61, avenue
du President Wilson, 94235 Cachan, France
| | - František Hartl
- Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD,
U.K
| |
Collapse
|
21
|
Hibble SJ, Chippindale AM, Bilbé EJ, Marelli E, Harris PJF, Hannon AC. Structures of Pd(CN)2 and Pt(CN)2: intrinsically nanocrystalline materials? Inorg Chem 2010; 50:104-13. [PMID: 21117699 DOI: 10.1021/ic101358q] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Analysis and modeling of X-ray and neutron Bragg and total diffraction data show that the compounds referred to in the literature as "Pd(CN)(2)" and "Pt(CN)(2)" are nanocrystalline materials containing small sheets of vertex-sharing square-planar M(CN)(4) units, layered in a disordered manner with an intersheet separation of ~3.44 Å at 300 K. The small size of the crystallites means that the sheets' edges form a significant fraction of each material. The Pd(CN)(2) nanocrystallites studied using total neutron diffraction are terminated by water and the Pt(CN)(2) nanocrystallites by ammonia, in place of half of the terminal cyanide groups, thus maintaining charge neutrality. The neutron samples contain sheets of approximate dimensions 30 Å × 30 Å. For sheets of the size we describe, our structural models predict compositions of Pd(CN)(2)·xH(2)O and Pt(CN)(2)·yNH(3) (x ≈ y ≈ 0.29). These values are in good agreement with those obtained from total neutron diffraction and thermal analysis, and are also supported by infrared and Raman spectroscopy measurements. It is also possible to prepare related compounds Pd(CN)(2)·pNH(3) and Pt(CN)(2)·qH(2)O, in which the terminating groups are exchanged. Additional samples showing sheet sizes in the range ~10 Å × 10 Å (y ~ 0.67) to ~80 Å × 80 Å (p = q ~ 0.12), as determined by X-ray diffraction, have been prepared. The related mixed-metal phase, Pd(1/2)Pt(1/2)(CN)(2)·qH(2)O (q ~ 0.50), is also nanocrystalline (sheet size ~15 Å × 15 Å). In all cases, the interiors of the sheets are isostructural with those found in Ni(CN)(2). Removal of the final traces of water or ammonia by heating results in decomposition of the compounds to Pd and Pt metal, or in the case of the mixed-metal cyanide, the alloy, Pd(1/2)Pt(1/2), making it impossible to prepare the simple cyanides, Pd(CN)(2), Pt(CN)(2), or Pd(1/2)Pt(1/2)(CN)(2), by this method.
Collapse
Affiliation(s)
- Simon J Hibble
- Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, UK.
| | | | | | | | | | | |
Collapse
|
22
|
Nodes WJ, Nutt DR, Chippindale AM, Cobb AJA. Enantioselective Intramolecular Michael Addition of Nitronates onto Conjugated Esters: Access to Cyclic γ-Amino Acids with up to Three Stereocenters. J Am Chem Soc 2010. [DOI: 10.1021/ja9092083] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
23
|
Chippindale AM, Bilbé EJ, Hibble SJ. Bis[bis(methoxycarbimido)aminato]copper(II) 1-methylpyrrolidin-2-one disolvate. Acta Crystallogr C 2009; 65:m485-7. [PMID: 19966434 DOI: 10.1107/s0108270109048252] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2009] [Accepted: 11/13/2009] [Indexed: 05/25/2023] Open
Abstract
The title compound, [Cu(C(4)H(8)N(3)O(2))(2)].2C(5)H(9)NO, consists of a neutral copper complex, in which the Cu(II) centre coordinates to two bis(methoxycarbimido)aminate ligands, solvated by two molecules of 1-methylpyrrolidin-2-one. The complex is planar and centrosymmetric, with the Cu(II) centre occupying a crystallographic inversion centre and adopting approximately square-planar geometry. N-H...O hydrogen-bonding interactions exist between the amine NH groups of the ligands and the O atoms of the 1-methylpyrrolidin-2-one molecules. The associated units pack to form sheets.
Collapse
Affiliation(s)
- Ann M Chippindale
- Department of Chemistry, University of Reading, Whiteknights, Reading, Berkshire RG6 6AD, England.
| | | | | |
Collapse
|
24
|
Nodes WJ, Nutt DR, Chippindale AM, Cobb AJA. Enantioselective Intramolecular Michael Addition of Nitronates onto Conjugated Esters: Access to Cyclic γ-Amino Acids with up to Three Stereocenters. J Am Chem Soc 2009; 131:16016-7. [DOI: 10.1021/ja9070915] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- William J. Nodes
- School of Pharmacy and Department of Chemistry, University of Reading, Whiteknights, Reading, Berks RG6 6AD, U.K
| | - David R. Nutt
- School of Pharmacy and Department of Chemistry, University of Reading, Whiteknights, Reading, Berks RG6 6AD, U.K
| | - Ann M. Chippindale
- School of Pharmacy and Department of Chemistry, University of Reading, Whiteknights, Reading, Berks RG6 6AD, U.K
| | - Alexander J. A. Cobb
- School of Pharmacy and Department of Chemistry, University of Reading, Whiteknights, Reading, Berks RG6 6AD, U.K
| |
Collapse
|
25
|
Chippindale AM, Hibble SJ. Helices, Chirality and Interpenetration: the Versatility and Remarkable Interconversion of Silver−Copper Cyanide Frameworks. J Am Chem Soc 2009; 131:12736-44. [DOI: 10.1021/ja903841e] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ann M. Chippindale
- School of Chemistry, University of Reading, Whiteknights, Reading, Berkshire RG6 6AD, United Kingdom
| | - Simon J. Hibble
- School of Chemistry, University of Reading, Whiteknights, Reading, Berkshire RG6 6AD, United Kingdom
| |
Collapse
|
26
|
Chippindale AM, Hibble SJ, Bilbé EJ. Dicopper(II) trihydroxide cyanoureate dihydrate. Acta Crystallogr C 2009; 65:i39-41. [PMID: 19578250 DOI: 10.1107/s0108270109020885] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2009] [Accepted: 06/02/2009] [Indexed: 11/10/2022] Open
Abstract
The title compound, poly[[mu-cyanoureato-tri-mu-hydroxido-dicopper(II)] dihydrate], {[Cu(2)(C(2)H(2)N(3)O)(OH)(3)].2H(2)O}(n), is a new layered copper(II) hydroxide salt (LHS) with cyanoureate ions and water molecules in the interlayer space. The three distinct copper(II) ions have distorted octahedral geometry: one Cu (symmetry 1) is coordinated to six hydroxide groups (4OH + 2OH), whilst the other two Cu atoms (symmetries 1 and 1) are coordinated to four hydroxides and two N atoms from nitrile groups of the cyanoureate ions (4OH + 2N). The structure is held together by hydrogen-bonding interactions between the terminal -NH(2) groups and the central cyanamide N atoms of organic anions associated with neighbouring layers.
Collapse
Affiliation(s)
- Ann M Chippindale
- Department of Chemistry, University of Reading, Whiteknights, Reading, Berks RG6 6AD, England.
| | | | | |
Collapse
|
27
|
Chippindale AM, Sharma AV, Hibble SJ. Potassium nickel(II) gallium phosphate hydrate, K[NiGa(2)(PO(4))(3)(H(2)O)(2)]. Acta Crystallogr Sect E Struct Rep Online 2009; 65:i38-i39. [PMID: 21583729 PMCID: PMC2977543 DOI: 10.1107/s1600536809015438] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2009] [Accepted: 04/24/2009] [Indexed: 11/21/2022]
Abstract
The title compound, potassium nickel(II) digallium tris(phosphate) dihydrate, K[NiGa2(PO4)3(H2O)2], was synthesized hydrothermally. The structure is constructed from distorted trans-NiO4(H2O)2 octahedra linked through vertices and edges to GaO5 trigonal bipyramids and PO4 tetrahedra, forming a three-dimensional framework of formula [NiGa2(PO4)3(H2O)2]−. The K, Ni and one P atom lie on special positions (Wyckoff position 4e, site symmetry 2). There are two sets of channels within the framework, one running parallel to the [10] direction and the other parallel to [001]. These intersect, forming a three-dimensional pore network in which the water molecules coordinated to the Ni atoms and the K+ ions required to charge balance the framework reside. The K+ ions lie in a highly distorted environment surrounded by ten O atoms, six of which are closer than 3.1Å. The coordinated water molecules are within hydrogen-bonding distance to O atoms of bridging Ga—O—P groups.
Collapse
Affiliation(s)
- Ann M Chippindale
- Department of Chemistry, University of Reading, Whiteknights, Reading, Berks RG6 6AD, England
| | | | | |
Collapse
|
28
|
Colquhoun HM, Chippindale AM, Chan YF. A tungsten complex containing a highly delocalized metal–ligand system. Acta Crystallogr C 2008; 64:m390-3. [DOI: 10.1107/s0108270108037232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2008] [Accepted: 11/10/2008] [Indexed: 11/10/2022] Open
|
29
|
Chippindale AM, Head LE, Hibble SJ. Simple linear asymmetrical complexes of silver(i): NC–Ag–NH3 and Br–Ag–NH3. Chem Commun (Camb) 2008:3010-2. [DOI: 10.1039/b803500h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
30
|
Gaslain FOM, Chippindale AM. catena-Poly[bis(ethane-1,2-diammonium) [manganese(II)-di-mu-phosphato-kappa(4)O:O']]: a one-dimensional manganese phosphate. Acta Crystallogr C 2007; 63:m537-40. [PMID: 17989476 DOI: 10.1107/s0108270107048111] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2007] [Accepted: 10/01/2007] [Indexed: 11/10/2022] Open
Abstract
The title compound, {(C(2)H(10)N(2))(2)[Mn(PO(4))(2)]}(n), contains anionic square-twisted chains of formula [Mn(PO(4))(2)](4-) constructed from corner-sharing four-membered rings of alternating MnO(4) and PO(4) units. The Mn and P atoms have distorted tetrahedral coordination and the Mn atom lies on a twofold axis. The linear manganese-phosphate chains are held together by hydrogen-bonding interactions involving the framework O atoms and the H atoms of the ethane-1,2-diammonium cations, which lie in the interchain spaces.
Collapse
|
31
|
Hibble SJ, Chippindale AM, Pohl AH, Hannon AC. Surprises from a Simple Material—The Structure and Properties of Nickel Cyanide. Angew Chem Int Ed Engl 2007; 46:7116-8. [PMID: 17683027 DOI: 10.1002/anie.200701246] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Simon J Hibble
- Department of Chemistry, University of Reading, Whiteknights, Reading, Berks RG6 6AD, UK.
| | | | | | | |
Collapse
|
32
|
Chan YF, Chippindale AM, Colquhoun HM, Drew MGB, Williams DJ. Extended-chain, multinuclear transition metal complexes bridged by cyanodiazenido(1-), [N=N-C[triple bond, length as m-dash]N]-, ligands. Dalton Trans 2007:3538-45. [PMID: 17680044 DOI: 10.1039/b704367h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Extended-chain complexes containing multiple transition metal centres linked by conjugated micro-cyanodiazenido(1-) ligands [N=N-C[triple bond, length as m-dash]N]- have been obtained by reaction of trans-[BrW(dppe)2(N2CN)], , [dppe=1,2-bis(diphenylphosphino)ethane] with dirhodium(II) tetra-acetate, bis(benzonitrile)palladium(II) dichloride, and bis(aqua)M(II) bis(hexafluoroacetylacetonate) (M=Mn, Ni, Cu, Zn): stronger Lewis acids such as tetrakis(acetonitrile)palladium(II) tetrafluoroborate and boron trifluoride promote hydrolysis of complex , leading to the isolation of a novel carbamoylhydrazido(2-) complex, trans-[BrW(dppe)2(N2HC=ONH2)]+[BF4]-.
Collapse
Affiliation(s)
- Yun Fu Chan
- Department of Chemistry, University of Reading, Whiteknights, Reading, UK RG6 6AD
| | | | | | | | | |
Collapse
|
33
|
Lees RJE, Powell AV, Watkin DJ, Chippindale AM. 1,4,8,11-Tetraazacyclotetradecane antimony(III) sulfide. Acta Crystallogr C 2006; 63:m27-9. [PMID: 17206039 DOI: 10.1107/s010827010605044x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2006] [Accepted: 11/22/2006] [Indexed: 11/10/2022] Open
Abstract
Poly[1,4,8,11-tetraazacyclotetradecane(2+) [hepta-mu-sulfido-trisulfidohexaantimony(III)]], {(C10H26N4)[Sb6S10]}n, consists of novel [Sb6S10]2- layers containing Sb2S2, Sb4S4 and Sb7S7 hetero-rings, which are separated by macrocyclic amine molecules. The macrocyclic amine molecules are disordered over two crystallographically distinct positions and are diprotonated in order to balance the charge of the anionic layers.
Collapse
Affiliation(s)
- Rachel J E Lees
- Department of Chemistry, Heriot-Watt University, Edinburgh EH14 4AS, Scotland
| | | | | | | |
Collapse
|
34
|
Chippindale AM. Poly[(2,2′-bipyridine-κ 2N, N′)(μ 2-dihydrogen phosphato-κ 2O: O′)(μ 2-hydrogen phosphato-κ 2O: O′)aluminium(III)], Al(2,2′-bipy)(HPO 4)(H 2PO 4), a layered inorganic–organic hybrid material. Acta Crystallogr C 2006; 62:m372-4. [PMID: 16891712 DOI: 10.1107/s0108270106024309] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2006] [Accepted: 06/23/2006] [Indexed: 11/10/2022] Open
|
35
|
Powell AV, Lees RJE, Chippindale AM. Macrocyclic amines as structure-directing agents for the synthesis of three-dimensional antimony-sulfide frameworks. Inorg Chem 2006; 45:4261-7. [PMID: 16676989 DOI: 10.1021/ic060263f] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new family of antimony sulfides, incorporating the macrocyclic tetramine 1,4,8,11-tetraazacyclotetradecane (cyclam), has been prepared by a hydrothermal method. [C10N4H26][Sb4S7] (1), [Ni(C10N4H24)][Sb4S7] (2), and [Co(C10N4H24)]x[C10N4H26](1-x)[Sb4S7] (0.08 < or = x < or = 0.74) (3) have been characterized by single-crystal X-ray diffraction, elemental analysis, thermogravimetry, and analytical electron microscopy. All three materials possess the same novel three-dimensional Sb4S7(2-) framework, constructed from layers of parallel arrays of Sb4S8(4-) chains stacked at 90 degrees to one another. In 1, doubly protonated macrocyclic cations reside in the channel structure of the antimony-sulfide framework. In 2 and 3, the cyclam acts as a ligand, chelating the divalent transition-metal cation. Analytical and X-ray diffraction data indicate that the level of metal incorporation in 2 is effectively complete, whereas in 3, both metalated and nonmetalated forms of the macrocycle coexist within the structure.
Collapse
Affiliation(s)
- Anthony V Powell
- Department of Chemistry, Heriot-Watt University, Edinburgh EH14 4AS, UK.
| | | | | |
Collapse
|
36
|
Chippindale AM, Cheyne SM, Hibble SJ. Interpenetrating Copper-Silver Cyanometallate Networks: Polymorphs and Topological Isomers. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200502372] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
37
|
Chippindale AM, Cheyne SM, Hibble SJ. Interpenetrating Copper-Silver Cyanometallate Networks: Polymorphs and Topological Isomers. Angew Chem Int Ed Engl 2005; 44:7942-6. [PMID: 16287191 DOI: 10.1002/anie.200502372] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ann M Chippindale
- School of Chemistry, University of Reading, Whiteknights, Reading, Berks, UK.
| | | | | |
Collapse
|
38
|
Abstract
Bis(methylammonium) octaantimony(III) dodecasulfide persulfide, (CH3NH3)2[Sb8S12(S2)], contains pairs of [Sb4S7]2- chains joined through an unusual persulfide bond to create infinite double [Sb8S14]2- chains. The double chains are interlocked by longer Sb...S interactions to form sheets approximately parallel to the (101) crystallographic plane. Methylammonium cations, formed by decomposition of 2-methylpropane-1,2-diamine during the synthesis, are located in large (Sb8S10) hetero-ring apertures created within the double chains.
Collapse
Affiliation(s)
- Rachel J E Lees
- Department of Chemistry, Heriot-Watt University, Edinburgh EH14 4AS, Scotland
| | | | | |
Collapse
|
39
|
Powell AV, Thun J, Chippindale AM. Directing the structures of silver-antimony sulphides: A new topological variant of the [Ag5Sb3S8]2− double layer. J SOLID STATE CHEM 2005. [DOI: 10.1016/j.jssc.2005.08.022] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
40
|
Lees RJ, Powell AV, Chippindale AM. The synthesis and characterisation of two new iron thioantimonates: [Fe(en)3]2Sb2S5·0.55H2O and [Fe(en)3]2Sb4S8. Polyhedron 2005. [DOI: 10.1016/j.poly.2005.06.017] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
41
|
Chippindale AM, Grimshaw MR, Powell AV, Cowley AR. Topotactic Oxidation of TiGaPO-1, a Pyridine-Templated Titanium Gallophosphate with a New Octahedral-Tetrahedral 3-D Framework Structure Containing TiIII/TiIV. Inorg Chem 2005; 44:4121-3. [PMID: 15934733 DOI: 10.1021/ic050399y] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The first 3-D open-framework TiGaPO complex, constructed from Ti(III)O(6), Ti(IV)O(6), GaO(4), and PO(4) polyhedra, contains pyridinium cations in a 1-D pore network and can be oxidized in air at 543 K with retention of the original framework structure.
Collapse
Affiliation(s)
- Ann M Chippindale
- School of Chemistry, The University of Reading, Whiteknights, Reading, Berks RG6 6AD, UK.
| | | | | | | |
Collapse
|
42
|
Gaslain FO, Chippindale AM. Synthesis and crystal structure of a 3-D zinc phosphate, [C5N2H14][Zn2(PO3(OH))3], containing (4.8) net sheets. CR CHIM 2005. [DOI: 10.1016/j.crci.2004.09.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
43
|
|
44
|
Chippindale AM, Hibble SJ, Cowley AR. Bending, Twisting, and Breaking CuCN Chains to Produce Framework Materials: The Reactions of CuCN with Alkali-Metal Halides†. Inorg Chem 2004; 43:8040-8. [PMID: 15578843 DOI: 10.1021/ic049011+] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reactions of the low-temperature polymorph of copper(I) cyanide (LT-CuCN) with concentrated aqueous alkali-metal halide solutions have been investigated. At room temperature, KX (X = Br and I) and CsX (X = Cl, Br, and I) produce the addition products K[Cu(2)(CN)(2)Br].H(2)O (I), K(3)[Cu(6)(CN)(6)I(3)].2H(2)O (II), Cs[Cu(3)(CN)(3)Cl] (III), Cs[Cu(3)(CN)(3)Br] (IV), and Cs(2)[Cu(4)(CN)(4)I(2)].H(2)O (V), with 3-D frameworks in which the -(CuCN)- chains present in CuCN persist. No reaction occurs, however, with NaX (X = Cl, Br, I) or KCl. The addition compounds, I-V, reconvert to CuCN when washed. Both low- and high-temperature polymorphs of CuCN (LT- and HT-CuCN) are produced, except in the case of Cs[Cu(3)(CN)(3)Cl] (III), which converts only to LT-CuCN. Heating similar AX-CuCN reaction mixtures under hydrothermal conditions at 453 K for 1 day produces single crystals of I-V suitable for structure determination. Under these more forcing conditions, reactions also occur with NaX (X = Cl, Br, I) and KCl. NaBr and KCl cause some conversion of LT-CuCN into HT-CuCN, while NaCl and NaI, respectively, react to form the mixed-valence Cu(I)/Cu(II) compounds [Cu(II)(OH(2))(4)][Cu(I)(4)(CN)(6)], a known phase, and [Cu(II)(OH(2))(4)][Cu(I)(4)(CN)(4)I(2)] (VI), a 3-D framework, which contains infinite -(CuCN)- chains. After 3 days of heating under hydrothermal conditions, the reaction between KI and CuCN produces [Cu(II)(OH(2))(4)][Cu(I)(2)(CN)I(2)](2) (VII), in which the CuCN chains are broken into single Cu-CN-Cu units, which in turn are linked into chains via iodine atoms and then into layers via long Cu-C and Cu-Cu interactions.
Collapse
Affiliation(s)
- Ann M Chippindale
- School of Chemistry, University of Reading, Whiteknights, Reading, Berks RG6 6AD, UK.
| | | | | |
Collapse
|
45
|
Vaqueiro P, Chippindale AM, Powell AV. [Co(en)3][Sb12S19]: A New Antimony Sulfide with a Zeolite-like Structure Containing One-Dimensional Channels. Inorg Chem 2004; 43:7963-5. [PMID: 15578831 DOI: 10.1021/ic048985z] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Solvothermal synthesis affords access to the first truly three-dimensional antimony-sulfide framework which contains one-dimensional circular channels.
Collapse
Affiliation(s)
- Paz Vaqueiro
- Department of Chemistry, Heriot-Watt University, Edinburgh EH14 4AS, UK
| | | | | |
Collapse
|
46
|
Hibble SJ, Eversfield SG, Cowley AR, Chippindale AM. Copper(I) cyanide: a simple compound with a complicated structure and surprising room-temperature reactivity. Angew Chem Int Ed Engl 2004; 43:628-30. [PMID: 14743423 DOI: 10.1002/anie.200352844] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Simon J Hibble
- School of Chemistry, University of Reading, Whiteknights, Reading, Berks RG6 6AD, UK.
| | | | | | | |
Collapse
|
47
|
Hibble SJ, Eversfield SG, Cowley AR, Chippindale AM. Copper(I) Cyanide: A Simple Compound with a Complicated Structure and Surprising Room-Temperature Reactivity. Angew Chem Int Ed Engl 2004. [DOI: 10.1002/ange.200352844] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
48
|
Vaqueiro P, Chippindale AM, Cowley AR, Powell AV. Templated Synthesis of the Novel Layered Silver−Antimony Sulfides [H3NCH2CH2NH2][Ag2SbS3] and [H3NCH2CH2NH2]2[Ag5Sb3S8]. Inorg Chem 2003; 42:7846-51. [PMID: 14632500 DOI: 10.1021/ic034926u] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Two new silver-antimony sulfides, [C(2)H(9)N(2)][Ag(2)SbS(3)] (1) and [C(2)H(9)N(2)](2)[Ag(5)Sb(3)S(8)] (2), have been prepared solvothermally in the presence of ethylenediamine and characterized by single-crystal X-ray diffraction, thermogravimetry, and elemental analysis. Compound 1 crystallizes in the space group Pn (a = 6.1781(1) A, b =11.9491(3) A, c = 6.9239(2) A, beta =111.164(1) degrees ) and 2 in the space group Pm (a = 6.2215(2) A, b = 15.7707(7) A, c = 11.6478(5) A, beta = 92.645(2) degrees ). The structure of 1 consists of chains of fused five-membered Ag(2)SbS(2) rings linked to form layers, between which the template molecules reside. Compound 2 contains honeycomb-like sheets of fused silver-antimony-sulfide six-membered rings linked to form double layers. The idealized structure can be considered to be an ordered defect derivative of that of lithium bismuthide, Li(3)Bi, and represents a new solid-state structure type.
Collapse
Affiliation(s)
- Paz Vaqueiro
- Department of Chemistry, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
| | | | | | | |
Collapse
|
49
|
Chippindale AM, Davies SG, Iwamoto K, Parkin RM, Smethurst CA, Smith AD, Rodriguez-Solla H. Asymmetric synthesis of cyclic β-amino acids and cyclic amines via sequential diastereoselective conjugate addition and ring closing metathesis. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(03)00411-3] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
50
|
Chippindale AM, Gaslain FOM, Bond AD, Powell AV. Synthesis, structure and magnetic characterisation of a new layered ammonium manganese(ii) diphosphate hydrate, (NH4)2[Mn3(P2O7)2(H2O)2]Electronic supplementary information (ESI) available: powder XRD data, atomic coordinates and thermal parameters, IR data, bond valence calculations, TGA. See http://www.rsc.org/suppdata/jm/b3/b304003h/. ACTA ACUST UNITED AC 2003. [DOI: 10.1039/b304003h] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|