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Gerasimchuk N, Pinks K, Salpadoru T, Cotton K, Michka O, Patrauchan MA, Wozniak KL. Non-Antibiotic Antimony-Based Antimicrobials. Molecules 2022; 27:7171. [PMID: 36363997 PMCID: PMC9654735 DOI: 10.3390/molecules27217171] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 10/10/2022] [Accepted: 10/14/2022] [Indexed: 07/21/2023] Open
Abstract
A series of the eight novel organoantimony(V) cyanoximates of Sb(C6H5)4L composition was synthesized using the high-yield heterogeneous metathesis reaction between solid AgL (or TlL) and Sb(C6H5)4Br in CH3CN at room temperature. Cyanoximes L were specially selected from a large group of 48 known compounds of this subclass of oximes on the basis of their water solubility and history of prior biological activity. The synthesized compounds are well soluble in organic solvents and were studied using a variety of conventional spectroscopic and physical methods. The crystal structures of all reported organometallic compounds were determined and revealed the formation of the distorted trigonal bipyramidal environment of the Sb atom and monodentate axial binding of acido-ligands via the O atom of the oxime group. The compounds are thermally stable in the solid state and in solution molecular compounds. For the first time, this specially designed series of organoantimony(V) compounds is investigated as potential non-antibiotic antimicrobial agents against three bacterial and two fungal human pathogens known for their increasing antimicrobial resistance. Bacterial pathogens included Gram-negative Escherichia coli and Pseudomonas aeruginosa, and Gram-positive Staphylococcus aureus. Fungal pathogens included Cryptococcus neoformans and Candida albicans. The cyanoximates alone showed no antimicrobial impact, and the incorporation of the SbPh4 group enabled the antimicrobial effect. Overall, the new antimony compounds showed a strong potential as both broad- and narrow-spectrum antimicrobials against selected bacterial and fundal pathogens and provide insights for further synthetic modifications of the compounds to increase their activities.
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Affiliation(s)
- Nikolay Gerasimchuk
- Department of Chemistry and Biochemistry, Temple Hall 456, Missouri State University, Springfield, MO 65897, USA
| | - Kevin Pinks
- Department of Chemistry and Biochemistry, Temple Hall 456, Missouri State University, Springfield, MO 65897, USA
| | - Tarosha Salpadoru
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK 74078, USA
| | - Kaitlyn Cotton
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK 74078, USA
| | - Olga Michka
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK 74078, USA
| | - Marianna A. Patrauchan
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK 74078, USA
| | - Karen L. Wozniak
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, OK 74078, USA
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2
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David M, Mitea R, Silvestru A. Silver(I) complexes based on diorganoselenium(II) ligands with amino or hydroxo functionalities. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.131243] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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3
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Domasevitch KV, Senchyk GA, Lysenko AB, Rusanov EB. Hydrogen-bonding landscape of the carbamoylcyanonitrosomethanide anion in the crystal structure of its ammonium salt. Acta Crystallogr E Crystallogr Commun 2021; 77:1103-1108. [PMID: 34868645 PMCID: PMC8587992 DOI: 10.1107/s2056989021010239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Accepted: 10/03/2021] [Indexed: 11/24/2022]
Abstract
The structure of the title salt, ammonium carbamoylcyanonitrosomethanide, NH4+·C3H2N3O2−, features the co-existence of different hydrogen-bonding patterns, which are specific to each of the three functional groups (nitroso, carbamoyl and cyano) of the methanide anion. The relatively simple scheme of these interactions allows the delineation of the supramolecular synthons, which may be applicable to crystal engineering of hydrogen-bonded solids containing polyfunctional methanide anions. The structure of the title salt, ammonium carbamoylcyanonitrosomethanide, NH4+·C3H2N3O2−, features the co-existence of different hydrogen-bonding patterns, which are specific to each of the three functional groups (nitroso, carbamoyl and cyano) of the methanide anion. The nitroso O-atoms accept as many as three N—H⋯O bonds from the ammonium cations [N⋯O = 2.688 (3)–3.000 (3) Å] to form chains of fused rhombs [(NH4)(O)2]. The most prominent bonds of the carbamoyl groups are mutual and they yield 21 helices [N⋯O = 2.903 (2) Å], whereas the cyano N-atoms accept hydrogen bonds from sterically less accessible carbamoyl H-atoms [N⋯N = 3.004 (3) Å]. Two weaker NH4+⋯O=C bonds [N⋯O = 3.021 (2), 3.017 (2) Å] complete the hydrogen-bonded environment of the carbamoyl groups. A Hirshfeld surface analysis indicates that the most important interactions are overwhelmingly O⋯H/H⋯O and N⋯H/H⋯N, in total accounting for 64.1% of the contacts for the individual anions. The relatively simple scheme of these interactions allows the delineation of the supramolecular synthons, which may be applicable to crystal engineering of hydrogen-bonded solids containing polyfunctional methanide anions.
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Chakraborty G, Park IH, Medishetty R, Vittal JJ. Two-Dimensional Metal-Organic Framework Materials: Synthesis, Structures, Properties and Applications. Chem Rev 2021; 121:3751-3891. [PMID: 33630582 DOI: 10.1021/acs.chemrev.0c01049] [Citation(s) in RCA: 242] [Impact Index Per Article: 80.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Gouri Chakraborty
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - In-Hyeok Park
- Graduate School of Analytical Science and Technology (GRAST), Chungnam National University, Daejeon 34134, South Korea
| | | | - Jagadese J. Vittal
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
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5
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Moon H, Lim SW, Kim D, Jung OS, Lee YA. Supramolecular isomerism between cyclodimeric and sinusoidal 1D coordination polymers: competition of tunable argentophilic vs. electrostatic interactions. CrystEngComm 2021. [DOI: 10.1039/d0ce01779e] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Anion exchanges of metallacyclodimeric nitrate to polyatomic anions crystallize in situ, resulting in a systematic supramolecular isomerism to 1D coordination polymers in mother liquor.
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Affiliation(s)
- Heehun Moon
- Department of Chemistry
- Pusan National University
- Busan 46241
- Republic of Korea
| | - Sang Woo Lim
- Department of Chemistry
- Pusan National University
- Busan 46241
- Republic of Korea
| | - Dongwon Kim
- Department of Chemistry
- Pusan National University
- Busan 46241
- Republic of Korea
| | - Ok-Sang Jung
- Department of Chemistry
- Pusan National University
- Busan 46241
- Republic of Korea
| | - Young-A Lee
- Department of Chemistry
- Jeonbuk National University
- Jeonju 54896
- Korea
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6
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Raubenheimer HG, Dobrzańska L. Interaction between Cu and Ag free ions and central metals in complexes with XHn units (X = B, Si, N, O, C, Al, Zn, Mg; n = 1, 2). Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2019.213052] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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7
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Zhang S, Hao A, Liu Z, Park JG, Liang R. A Highly Stretchable Polyacrylonitrile Elastomer with Nanoreservoirs of Lubricant Using Cyano-Silver Complexes. NANO LETTERS 2019; 19:3871-3877. [PMID: 31091875 DOI: 10.1021/acs.nanolett.9b01055] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Stretchable materials are indispensable for applications such as deformable devices, wearable electronics, and future robotics. However, designs for new elastomers with high stretchability have undergone only limited research. Here we have fabricated highly stretchable Ag+/polyacrylonitrile elastomer with nanoreservoirs of lubricant using cyano-silver complexes. The prepared products feature nanoconfinement structures of lubricant surrounded by polymer chains with coordination bond through chelates of cyano-silver, resulting in an enhanced stretchability of more than 600% from 2%. The elastomeric properties were investigated, and a mechanical response model was proposed, which explained the structural evolution including the polymer chain fluidity under external deformation. Also, the easy breakage and dynamic reformation of cyano-silver coordination complexes promises a strain recovery under various stretching conditions. This elastomer itself can directly work as sensors and open paths to alternative substrates for soft electronics development.
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Affiliation(s)
- Songlin Zhang
- High-Performance Materials Institute, Department of Industrial and Manufacturing Engineering, FAMU-FSU College of Engineering , Florida State University , 2005 Levy Avenue , Tallahassee , Florida 32310 , United States
| | - Ayou Hao
- High-Performance Materials Institute, Department of Industrial and Manufacturing Engineering, FAMU-FSU College of Engineering , Florida State University , 2005 Levy Avenue , Tallahassee , Florida 32310 , United States
| | - Zhe Liu
- High-Performance Materials Institute, Department of Industrial and Manufacturing Engineering, FAMU-FSU College of Engineering , Florida State University , 2005 Levy Avenue , Tallahassee , Florida 32310 , United States
| | - Jin Gyu Park
- High-Performance Materials Institute, Department of Industrial and Manufacturing Engineering, FAMU-FSU College of Engineering , Florida State University , 2005 Levy Avenue , Tallahassee , Florida 32310 , United States
| | - Richard Liang
- High-Performance Materials Institute, Department of Industrial and Manufacturing Engineering, FAMU-FSU College of Engineering , Florida State University , 2005 Levy Avenue , Tallahassee , Florida 32310 , United States
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Gerasimchuk N. Chemistry and applications of cyanoximes and their metal complexes. Dalton Trans 2019; 48:7985-8013. [PMID: 31090771 DOI: 10.1039/c9dt01057b] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
During the past three decades, considerable research effort has been dedicated to a new class of organic ligands - cyanoximes - which have the general formula NC-C([double bond, length as m-dash]NOH)-R, where R is an electron-withdrawing group. The presence of the CN group makes cyanoximes ∼10 000 times more acidic and better ligands than other known conventional monoximes and dioximes. Also, in numerous cases, this group provides extra nitrogen donor atoms to support the formation of bridges between metal centres in the obtained coordination polymers. With 36 different R groups, the most abundant is the family of mono-cyanoximes, followed by 7 bis-cyanoximes which include aromatic and aliphatic spacers and, lately, tris-cyanoxime representing a 'tripod'. The total number of obtained and characterized compounds is 44. These simple, low molecular weight molecules represent a series of new excellent ampolydentate ligands - 'molecular Lego', or building blocks - for coordination and organometallic chemistry. Uncomplexed ligands, their alkali metal salts, and metal complexes show a large spectrum of biological activity, ranging from growth regulation in plants and antimicrobial activity, to significant in vitro and in vivo cytotoxicity against human cancers. Currently, there are more than three hundred cyanoxime-based complexes, synthesized and studied using a variety of different spectroscopic methods and X-ray analysis. In this review, the preparation and stereochemistry of cyanoxime ligands, their structures and properties, and the most interesting coordination compounds with a broad spectrum of practical applications are summarized.
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Affiliation(s)
- Nikolay Gerasimchuk
- Missouri State University, Department of Chemistry, Temple Hall 456, Springfield, MO 65897, USA.
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9
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Potočňák I, Bukrynov O, Kliuikov A, Čiǽmár E, Vitushkina S, Váhovská L, Dušek M. A Cu II complex with an carbamoylcyanonitrosomethanide ligand formed in situ by the nucleophilic addition of water to dicyanonitrosomethanide: structure, spectral and magnetic properties. ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2018; 74:584-589. [PMID: 29726467 DOI: 10.1107/s2053229618005697] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Accepted: 04/11/2018] [Indexed: 11/10/2022]
Abstract
The complex (2,2'-biquinoline-κ2N,N')(carbamoylcyanonitrosomethanide-κ2N,O)chloridocopper(II) acetonitrile monosolvate, [Cu(C3H2N3O2)Cl(C18H12N2)]·CH3CN or [Cu(ccnm)Cl(biq)]·acn (acn is acetonitrile, biq is 2,2'-biquinoline and ccnm is carbamoylcyanonitrosomethanide), (I), was prepared as a result of nucleophilic addition of water to the dicyanonitrosomethanide ion in the presence of CuII and biq. IR spectroscopy confirmed the presence of ccnm, biq and acn in (I). The solid-state structure consists of the neutral complex containing ccnm and biq ligands, coordinated to the CuII atom in a bidendate chelating manner, and a chloride ligand, resulting in a distorted tetragonal pyramidal coordination of CuII. The asymmetric unit is supplemented by one molecule of solvated acn which, along with the nitrile group of ccnm, serves as an acceptor in intermolecular hydrogen bonding, creating infinite chains along the b axis. Magnetic measurements revealed a paramagnetic behaviour with a very small Weiss temperature Θ = -0.32 K and high anisotropy of the g tensor (gx = 2.036, gy = 2.120 and gz = 2.205).
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Affiliation(s)
- Ivan Potočňák
- P. J. Šafárik University in Košice, Faculty of Sciences, Institute of Chemistry, Department of Inorganic Chemistry, Moyzesova 11, SK-041 54 Košice, Slovakia
| | - Oleksandr Bukrynov
- V.N. Karazin Kharkiv National University, Faculty of Chemistry, Department of Applied Chemistry, Svobody sq. 4, UA-61022 Kharkiv, Ukraine
| | - Andrii Kliuikov
- P.J. Šafárik University in Košice, Faculty of Sciences, Institute of Physics, Park Angelinum 9, SK-041 54 Košice, Slovakia
| | - Erik Čiǽmár
- P.J. Šafárik University in Košice, Faculty of Sciences, Institute of Physics, Park Angelinum 9, SK-041 54 Košice, Slovakia
| | - Svitlana Vitushkina
- V.N. Karazin Kharkiv National University, Faculty of Chemistry, Department of Applied Chemistry, Svobody sq. 4, UA-61022 Kharkiv, Ukraine
| | - Lucia Váhovská
- University of Veterinary Medicine and Pharmacy in Košice, Department of Chemistry, Biochemistry and Biophysics, Institute of Biochemistry, Komenského 73, SK-041 84 Košice, Slovakia
| | - Michal Dušek
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, CZ-182 21, Praha 8, Czech Republic
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10
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Achar G, Shahini CR, Patil SA, Małecki JG, Pan SH, Lan A, Chen XR, Budagumpi S. Sterically modulated silver(I) complexes of coumarin substituted benzimidazol-2-ylidenes: Synthesis, crystal structures and evaluation of their antimicrobial and antilung cancer potentials. J Inorg Biochem 2018. [PMID: 29529471 DOI: 10.1016/j.jinorgbio.2018.02.012] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
In this contribution, a series of sterically-encumbered coumarin substituted benzimidazole-based N-heterocyclic carbene (NHC) precursors (1-12) and their silver(I)-NHC complexes (13-24) are reported. Molecular structure of NHC precursors 8 and 12 and cationic complexes 15 and 16 was established by single crystal X-ray diffraction method. The silver(I) complexes demonstrated various significant intramolecular agostic-like interactions operating between the metal center and the hydrogen atoms of the substituents alongside a variety of feeble π-π stacking interactions. A distorted linear coordination geometry is documented at the silver(I) center with the anti-arrangement of the ligands. Further, the complexes demonstrated promising antibacterial properties against Gram positive and Gram negative bacterial strains, especially complex 18 displayed a minimum inhibitory concentration (MIC) of 2 and 4 μg/mL against S. aureus and E. coli, and P. aeruginosa, respectively. Furthermore, complexes 14, 15, 16 and 18 were found cytotoxic against the human lung cancer cell lines A549 and H1975 with the IC50 (concentration of the test sample required to kill 50% of the cell population) value under 10 μM, while mono-NHC complex 20 displayed a potential drug window with the IC50 of 13.7 ± 2.70 and 14.5 ± 1.20 μM against the cancer cell lines H1975 and A549, respectively. Notably, these complexes displayed relatively lesser cytotoxic behaviour against the normal skin fibroblast cell line, Hs68. All the NHC precursors displayed significantly lower biological activities compared with their respective complexes, indicating the utility of silver(I) ions in antimicrobial and antilung cancer applications.
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Affiliation(s)
- Gautam Achar
- Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Kanakapura, Ramanagaram, Bangalore 562112, India
| | - C R Shahini
- Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Kanakapura, Ramanagaram, Bangalore 562112, India
| | - Siddappa A Patil
- Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Kanakapura, Ramanagaram, Bangalore 562112, India
| | - Jan Grzegorz Małecki
- Department of Crystallography, Institute of Chemistry, University of Silesia, 9th Szkolna St., 40-006 Katowice, Poland
| | - Szu-Hua Pan
- Graduate Institute of Medical Genomics and Proteomics, College of Medicine, National Taiwan University, Taipei 100, Taiwan
| | - Albert Lan
- Graduate Institute of Medical Genomics and Proteomics, College of Medicine, National Taiwan University, Taipei 100, Taiwan
| | - Xuan-Ren Chen
- Graduate Institute of Medical Genomics and Proteomics, College of Medicine, National Taiwan University, Taipei 100, Taiwan
| | - Srinivasa Budagumpi
- Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Kanakapura, Ramanagaram, Bangalore 562112, India.
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Opalade AA, Karmakar A, Rúbio GMDM, Pombeiro AJL, Gerasimchuk N. Zinc Complexes with Cyanoxime: Structural, Spectroscopic, and Catalysis Studies in the Pivaloylcyanoxime–Zn System. Inorg Chem 2017; 56:13962-13974. [DOI: 10.1021/acs.inorgchem.7b01891] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Adedamola A. Opalade
- Department of Chemistry, Temple Hall 431, Missouri State University, Springfield, Missouri 65897, United States
| | - Anirban Karmakar
- Centro de Química Estrutural (CQE), Instituto SuperiorTécnico (IST) University of Lisbon, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
| | - G. M. D. M. Rúbio
- Centro de Química Estrutural (CQE), Instituto SuperiorTécnico (IST) University of Lisbon, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Armando J. L. Pombeiro
- Centro de Química Estrutural (CQE), Instituto SuperiorTécnico (IST) University of Lisbon, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Nikolay Gerasimchuk
- Department of Chemistry, Temple Hall 431, Missouri State University, Springfield, Missouri 65897, United States
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12
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Cheadle C, Ratcliiff J, Berezin M, Pal’shin V, Nemykin VN, Gerasimchuk NN. Shortwave infrared luminescent Pt-nanowires: a mechanistic study of emission in solution and in the solid state. Dalton Trans 2017; 46:13562-13581. [PMID: 28952624 PMCID: PMC5638302 DOI: 10.1039/c7dt02317k] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Several complexes of "PtL2" composition containing two cyanoxime anions - 2-oximino-2-cyano-N-piperidineacetamide (PiPCO-) and 2-oximino-2-cyano-N-morpholylacetamide (MCO-) - have been obtained and characterized both in solution and in the solid state. Complexes exist as two distinct polymorphs: monomeric yellow complexes and dark-green [PtL2]n 1D polymers, while for the MCO- anion a red, solvent containing dimeric [Pt(MCO)2·DMSO]2 complex has also been isolated. The interconversion of polymorphs was investigated. The monomeric PtL2 units are arranged into anisotropic extended solid [PtL2]n polymers with the help of PtPt metallophilic interactions. Crystal structures of monomeric PtL2 (L = PiPCO-, MCO-) and red dimeric [Pt(MCO)2·DMSO]2 complexes were determined and revealed the cis-arrangement of cyanoxime anions. The Pt-Pt distance in the "head-to-tail" red dimer was found to be 3.133 Å. The structure of the polymeric [Pt(PiPCO)2]n compound was elucidated using the EXAFS method and evidenced the formation of Pt-wires with ∼3.15 Å intermetallic separation. The EPR spectra of both 1D polymers at variable temperatures indicate the absence of Pt(iii) species. Both pure dark-green [PtL2]n polymers showed a considerable room temperature electrical conductivity of 20-30 S cm-1, which evidences the formation of a mixed valence Pt(ii)/Pt(iv) system. We discovered that these 1D polymeric [PtL2]n complexes show an intense NIR fluorescence beyond 1000 nm, while yellow monomeric PtL2 complexes are not emissive at all. The room temperature excitation spectra of 1D polymeric [PtL2]n complexes demonstrated their strong emission beyond 1000 nm regardless of the used excitation wavelength between 350 and 800 nm, which is typical of systems with delocalized charge carriers. For the first time the formation of mixed valence "metal wires" held together by metallophilic interactions is directly linked both with an intense fluorescence in the NIR region of the spectrum and with the electrical conductivity. The effect of the concentration of [PtL2]n complexes dispersed in the dielectric salt matrix on the photoluminescence wavelength and intensity was investigated. Both polymers show a quantum yield that is remarkably high for this region of the spectrum, reaching ∼2%. Variable temperature emission of polymeric [PtL2]n in the -190-+60 °C range was studied as well.
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Affiliation(s)
- Carl Cheadle
- Department of Chemistry, Temple Hall 431, Missouri State University, Springfield, MO 65897, USA
| | - Jessica Ratcliiff
- Department of Chemistry, Temple Hall 431, Missouri State University, Springfield, MO 65897, USA
| | - Mikhail Berezin
- Department of Radiology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Vadim Pal’shin
- J. Bennett Johnston Sr., Center for Advanced Microstructures & Devices, Louisiana State University, 6980 Jefferson Hwy, Baton Rouge, LA 70806, USA
| | - Victor N. Nemykin
- Department of Chemistry and Biochemistry, University of Minnesota-Duluth, 1039 University Drive, Duluth, MN 55812, USA
| | - Nikolay N. Gerasimchuk
- Department of Chemistry, Temple Hall 431, Missouri State University, Springfield, MO 65897, USA
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13
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Mann A, Gerasimchuk N, Silchenko S. New non-aggregating bivalent cis-ML2 (M = Pd, Pt; L = pivaloylcyanoxime). Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2015.10.040] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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14
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Hoffmann RC, Schneider JJ. Synergistic and Antagonistic Ligand Effects in the Transformation of Silver Compounds of Keto- and Cyano-Functionalised Oximates and Nitronates: A Systematic Study Using Thermal Analysis. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500704] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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15
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González J, Reyes-Lezama M, Corona D, Cuevas-Yañez E. Chiral bis(amino alcohol) silver complex derived from (+)-camphor. J COORD CHEM 2015. [DOI: 10.1080/00958972.2015.1012071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Jaime González
- Centro Conjunto de Investigación en Química Sustentable UAEM-UNAM, Toluca, Mexico
| | - Marisol Reyes-Lezama
- Centro Conjunto de Investigación en Química Sustentable UAEM-UNAM, Toluca, Mexico
| | - David Corona
- Centro Conjunto de Investigación en Química Sustentable UAEM-UNAM, Toluca, Mexico
| | - Erick Cuevas-Yañez
- Centro Conjunto de Investigación en Química Sustentable UAEM-UNAM, Toluca, Mexico
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Klaus DR, Keene M, Silchenko S, Berezin M, Gerasimchuk N. 1D polymeric platinum cyanoximate: a strategy toward luminescence in the near-infrared region beyond 1000 nm. Inorg Chem 2015; 54:1890-900. [PMID: 25615022 PMCID: PMC7441041 DOI: 10.1021/ic502805h] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
We report the synthesis and properties of the first representative of a new class of PtL2 complexes with ambidentate mixed-donor cyanoxime ligands [L = 2-cyano-2-oximino-N,N'-diethylaminoacetamide, DECO (1)]. Three differently colored polymorphs of "Pt(DECO)2" (3-5) were isolated, with the first two being crystallographically characterized. The dark-green complex [Pt(DECO)2]n (5) spontaneously forms in aqueous solution via aggregation of yellow monomeric complex 3 into the red dimer [Pt(DECO)2]2 (4), followed by further oligomerization into coordination polymer 5. A spectroscopic and light-scattering study revealed a "poker-chips"-type 1D polymeric structure of 5 in which units are held by noncovalent metallophilic interactions, forming a Pt---Pt wire. The polymer 5 shows a broad absorption at 400-900 nm and emission at unusually long wavelengths in the range of 1000-1100 nm in the solid state. The near-infrared (NIR) emission of polymer 5 is due to the formation of a small amount of nonstoichiometric mixed-valence Pt(II)/Pt(IV) species during synthesis. A featureless electron paramagnetic resonance spectrum of solid sample 5 recorded at +23 and -193 °C evidences the absence of Pt(III) states, and the compound represents a "solid solution" containing mixed-valence Pt(II)/Pt(IV) centers. Exposure of KBr pellets with 5% 5 to Br2 vapors leads to an immediate ∼30% increase in the intensity of photoluminescence at 1024 nm, which confirms the role and importance of mixed-valence species for the NIR emission. Thus, the emission is further enhanced upon additional oxidation of Pt(II) centers, which improves delocalization of electrons along the Pt---Pt vector. Other polymorph of the "Pt(DECO)2" complex--monomer--did not demonstrate luminescent properties in solutions and the solid state. An excitation scan of 5 embedded in KBr tablets revealed an emission only weakly dependent on the wavelength of excitation. The NIR emission of quasi-1D complex 5 was studied in the range of -193 to +67 °C. Data showed a blue shift of λmax and a simultaneous increase in the emission line intensity with a temperature rise, which is explained by analogy with similar behavior of known quasi-1D K2[Pt(CN)4]-based solids, quantum dots, and quantum wells with delocalized carriers. The presented finding opens a route to a new class of platinum cyanoxime based NIR emissive complexes that could be used in the design of novel NIR emitters and imaging agents.
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Affiliation(s)
- Danielle R. Klaus
- Department of Chemistry, Missouri State University (MSU), Temple Hall 456, Springfield, Missouri 56897, United States
| | - Matthew Keene
- Department of Chemistry, Missouri State University (MSU), Temple Hall 456, Springfield, Missouri 56897, United States
| | - Svitlana Silchenko
- Absorption Systems, Inc.; 440 Creamery Way, S. 300, Exton, Pennsylvania 19341, United States
| | - Mikhail Berezin
- Department of Radiology, Washington University of St. Louis Medical School, St. Louis, Missouri 63110, United States
| | - Nikolay Gerasimchuk
- Department of Chemistry, Missouri State University (MSU), Temple Hall 456, Springfield, Missouri 56897, United States
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Schmidbaur H, Schier A. Argentophilic Interactions. Angew Chem Int Ed Engl 2014; 54:746-84. [DOI: 10.1002/anie.201405936] [Citation(s) in RCA: 618] [Impact Index Per Article: 61.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Indexed: 11/06/2022]
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Chesman ASR, Turner DR, Langley SK, Moubaraki B, Murray KS, Deacon GB, Batten SR. Synthesis and Structure of New Lanthanoid Carbonate “Lanthaballs”. Inorg Chem 2014; 54:792-800. [DOI: 10.1021/ic5016115] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Anthony S. R. Chesman
- School of Chemistry Monash University, Wellington Road, Clayton, Victoria 3800, Australia
- CSIRO Manufacturing Flagship, Bayview Avenue, Clayton, Victoria 3168, Australia
| | - David R. Turner
- School of Chemistry Monash University, Wellington Road, Clayton, Victoria 3800, Australia
| | - Stuart K. Langley
- School of Chemistry Monash University, Wellington Road, Clayton, Victoria 3800, Australia
| | - Boujemaa Moubaraki
- School of Chemistry Monash University, Wellington Road, Clayton, Victoria 3800, Australia
| | - Keith S. Murray
- School of Chemistry Monash University, Wellington Road, Clayton, Victoria 3800, Australia
| | - Glen B. Deacon
- School of Chemistry Monash University, Wellington Road, Clayton, Victoria 3800, Australia
| | - Stuart R. Batten
- School of Chemistry Monash University, Wellington Road, Clayton, Victoria 3800, Australia
- Department of Chemistry, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
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20
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Gerasimchuk N. Synthesis, Properties, and Applications of Light-Insensitive Silver(I) Cyanoximates. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402251] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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21
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Riddles CN, Whited M, Lotlikar SR, Still K, Patrauchan M, Silchenko S, Gerasimchuk N. Synthesis and Characterization of Two Cyanoxime Ligands, Their Precursors, and Light Insensitive Antimicrobial Silver(I) Cyanoximates. Inorganica Chim Acta 2014; 412:94-103. [PMID: 24707061 PMCID: PMC3974210 DOI: 10.1016/j.ica.2013.12.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
High-yield syntheses of N-piperidine-cyanacetamide (1), N-morpholyl-cyanacetamide (4) and their oxime derivatives N-piperidine-2-cyano-2-oximino-acetamide (HPiPCO, 2) and N-morpholyc-2-cyano-2-oximino-acetamide (HMCO, 5) were developed using two-step preparations. At first, the reactions of neat cyanoacetic acid esters and the respective cyclic secondary amines such as piperideine and morpholine afforded pure cyanacetamides, which were converted into cyanoximes at room temperature using the nitrosation reaction with gaseous CH3ONO. The synthesized compounds were investigated by means of IR, 1H, 13C and UV-visible spectroscopy. Crystal structures of two starting substituted cyan-acetamides and two target cyanoximes were determined. Silver(I) complexes of AgL composition (L = PipCO, 3; MCO, 6) were prepared in high yield. Both metal complexes are thermally stable above 100oC, and remarkably stable to high intensity visible light. The stability of dried AgL compounds towards short wavelength UV-radiation (a frequently used germicidal light) was examined using diffusion reflectance spectroscopy. Both complexes demonstrate slow photoreduction within ~3 hrs, observable as a gradual color change and darkening due to the formation of fine (nano-scale) particles of metallic silver. The complex Ag(MCO), 6, is about 2.6 times less stable towards UV-radiation than its more lypophyllic analog Ag(PipCO), 3. Antimicrobial and biofilm growth inhibition properties of the prepared solid acrylate-based polymeric composites containing embedded silver(I) cyanoximates were investigated using three human pathogens: P. aeruginosa PAO1 (wound isolate), S. aureus NRS70 (methicillin resistant respiratory isolate), and S. mutans UA159 (cariogenic dental isolate). Studies showed that both 3 and 6 compounds completely abolished the growth of PAO1 at 0.5 weight % concentration, and the growth of UA159 and NRS70 at 1% concentration. Moreover, data demonstrates that complexes 3 and 6 also inhibit both planktonic and biofilm growth of Gram-positive and Gram-negative bacterial pathogens. The demonstrated thermal stability and pronounced antimicrobial activity of both silver(I) cyanoximates indicates the strong potential for the studied complexes to be used as light insensitive antimicrobial additives to light-curable adhesives that set indwelling devices in place.
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Affiliation(s)
- Courtney N. Riddles
- Department of Chemistry, Temple Hall 456, Missouri State University, Springfield, MO 65897
| | - Mark Whited
- Department of Chemistry, Temple Hall 456, Missouri State University, Springfield, MO 65897
| | - Shalaka R. Lotlikar
- Department of Microbiology and Molecular Genetics, 307 Life Sciences East, Oklahoma State University, Stillwater, OK 74078
| | - Korey Still
- Department of Microbiology and Molecular Genetics, 307 Life Sciences East, Oklahoma State University, Stillwater, OK 74078
| | - Marianna Patrauchan
- Department of Microbiology and Molecular Genetics, 307 Life Sciences East, Oklahoma State University, Stillwater, OK 74078
| | | | - Nikolay Gerasimchuk
- Department of Chemistry, Temple Hall 456, Missouri State University, Springfield, MO 65897
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Beeching LJ, Hawes CS, Turner DR, Batten SR. The influence of anion, ligand geometry and stoichiometry on the structure and dimensionality of a series of AgI-bis(cyanobenzyl)piperazine coordination polymers. CrystEngComm 2014. [DOI: 10.1039/c4ce00816b] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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23
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Cheadle C, Gerasimchuk N, Barnes CL, Tyukhtenko SI, Silchenko S. The first bis-cyanoxime: synthesis and properties of a new versatile and accessible polydentate bifunctional building block for coordination and supramolecular chemistry. Dalton Trans 2013; 42:4931-46. [PMID: 23385567 DOI: 10.1039/c2dt31924a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new multidentate bifunctional organic ligand – di-N,N′-(2-cyano-2-oximinoacetyl)piperazine – was synthesized in high yield using a two-step procedure carried out under ambient conditions. At first, the reaction of piperazine and neat methylcyanoacetate led to the di-N,N′-(cyanoacetyl)piperazine (1), which then was converted into bis-cyanoxime, di-N,N′-(2-cyano-2-oximinoacetyl)piperazine (HL, 2) using a room temperature nitrosation reaction with gaseous methylnitrite. Synthesized bis-cyanoxime was characterized by 1H, 13C NMR, UV-visible, IR spectroscopy and the X-ray analysis. The ligand 2 exists as a mixture of three diastereomers arising from the syn- and anti-geometry of the cyanoxime group. The prolonged crystallization of 2 from an ethanol–water mixture leads to the formation of: (a) colorless crystals that according to the X-ray analysis contain a 51.2:48.8% co-crystallized mixture of both isomers that have the same H-bonding motif (minority), and (b) a white amorphous material that represents an almost pure anti-isomer (majority). The deprotonation of 2 leads to the formation of a yellow dianion that demonstrated pronounced solvatochromism of its n → π* transition in the nitroso-chromophore. The disodium salt Na2L·4H2O (3) was obtained from 2 using NaOC2H5 in ethanol. The new bis-cyanoxime 2 reacts with Tl2CO3 and AgNO3 in aqueous solutions with the formation of light-stable, sparingly soluble yellow precipitates of M′2L·xH2O composition (M′ = Tl, Ag; Tl = 4, x = 0; Ag = 5, x = 2). The reaction of 3 with Ni2+ or K2M′′Cl4 (M′′ = Pd, Pt) in aqueous solutions leads to NiL·4H2O (6), PdL·4H2O (7) and PtL·5H2O (8). The crystal structure of 4 was determined and revealed the formation of a 3D-coordination polymeric complex in which the bis-cyanoxime acts as a dianionic, bridging, formally decadentate ligand. Each Tl(I) center has two bonds (2.655, 2.769 Å), shorter than the sum of ionic radii Tl–O (oxime group), and three longer, >2.89 Å, mostly electrostatic Tl···O contacts, involving oxygen atoms of the amide-group and the oxime-group of neighboring units. Among several possible binding modes, the coordination of the bis-cyanoxime dianion of 2 adopted in complex 4 is unusual, and evidenced its great potential as a versatile building block for coordination and supramolecular chemistry.
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Affiliation(s)
- Carl Cheadle
- Department of Chemistry, Temple Hall 432, Missouri State University, Springfield, MO 65897, USA
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Aakeröy CB, Epa KN, Forbes S, Desper J. Competing hydrogen-bond donors: phenols vs. cyanooximes. CrystEngComm 2013. [DOI: 10.1039/c3ce41023d] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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25
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Ratcliff J, Durham P, Keck M, Mokhir A, Gerasimchuk N. Part 2: In vitro cytotoxicity studies of two ML2 complexes (M = Pd, Pt; L = 2-cyano-2-isonitroso-N-morpholylacetamide, HMCO. Inorganica Chim Acta 2012. [DOI: 10.1016/j.ica.2011.12.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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26
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Cyanoacetamide-based oxime carbonates: an efficient, simple alternative for the introduction of Fmoc with minimal dipeptide formation. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.02.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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27
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Dawn S, Salpage SR, Smith MD, Sharma SK, Shimizu LS. A trinuclear silver coordination polymer from a bipyridine bis-urea macrocyclic ligand and silver triflate. INORG CHEM COMMUN 2012. [DOI: 10.1016/j.inoche.2011.09.045] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Dai JW, Tong ML. Alkali–lanthanide heterometallic coordination polymers based on 2,2′-bipyridine-6,6′-dicarboxylate: synthesis, structure, and luminescent properties. CrystEngComm 2012. [DOI: 10.1039/c2ce05828f] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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Eaidkong T, Mungkarndee R, Phollookin C, Tumcharern G, Sukwattanasinitt M, Wacharasindhu S. Polydiacetylene paper-based colorimetric sensor array for vapor phase detection and identification of volatile organic compounds. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm16273c] [Citation(s) in RCA: 131] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Stephenson A, Ward MD. Coordination chemistry of Ag(i) with bridging ligands based on pyrazolyl–pyridine termini: polymers, helicates and a bow-tie. RSC Adv 2012. [DOI: 10.1039/c2ra21757k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
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31
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Yanai N, Kitayama K, Hijikata Y, Sato H, Matsuda R, Kubota Y, Takata M, Mizuno M, Uemura T, Kitagawa S. Gas detection by structural variations of fluorescent guest molecules in a flexible porous coordination polymer. NATURE MATERIALS 2011; 10:787-93. [PMID: 21892178 DOI: 10.1038/nmat3104] [Citation(s) in RCA: 261] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2011] [Accepted: 07/26/2011] [Indexed: 05/05/2023]
Abstract
The development of a new methodology for visualizing and detecting gases is imperative for various applications. Here, we report a novel strategy in which gas molecules are detected by signals from a reporter guest that can read out a host structural transformation. A composite between a flexible porous coordination polymer and fluorescent reporter distyrylbenzene (DSB) selectively adsorbed CO₂ over other atmospheric gases. This adsorption induced a host transformation, which was accompanied by conformational variations of the included DSB. This read-out process resulted in a critical change in DSB fluorescence at a specific threshold pressure. The composite shows different fluorescence responses to CO₂ and acetylene, compounds that have similar physicochemical properties. Our system showed, for the first time, that fluorescent molecules can detect gases without any chemical interaction or energy transfer. The host-guest coupled transformations play a pivotal role in converting the gas adsorption events into detectable output signals.
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Affiliation(s)
- Nobuhiro Yanai
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
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An Excursion into the Intriguing World of Polymeric Tl(I) and Ag(I) Cyanoximates. Polymers (Basel) 2011. [DOI: 10.3390/polym3031475] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
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33
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Ilie A, Raţ CI, Scheutzow S, Kiske C, Lux K, Klapötke TM, Silvestru C, Karaghiosoff K. Metallophilic Bonding and Agostic Interactions in Gold(I) and Silver(I) Complexes Bearing a Thiotetrazole Unit. Inorg Chem 2011; 50:2675-84. [DOI: 10.1021/ic102595d] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Adriana Ilie
- Department of Chemistry, Ludwig-Maximilians-University Butenandtstrasse. 5-13 (Haus D), Munich, D-81377, Grosshadern, Germany
- Faculty of Chemistry & Chemical Engineering, Babes-Bolyai University, Arany Janos str. No. 11, 400028, Cluj-Napoca, Romania
| | - Ciprian I. Raţ
- Faculty of Chemistry & Chemical Engineering, Babes-Bolyai University, Arany Janos str. No. 11, 400028, Cluj-Napoca, Romania
| | - Susanne Scheutzow
- Department of Chemistry, Ludwig-Maximilians-University Butenandtstrasse. 5-13 (Haus D), Munich, D-81377, Grosshadern, Germany
| | - Christiane Kiske
- Department of Chemistry, Ludwig-Maximilians-University Butenandtstrasse. 5-13 (Haus D), Munich, D-81377, Grosshadern, Germany
| | - Karin Lux
- Department of Chemistry, Ludwig-Maximilians-University Butenandtstrasse. 5-13 (Haus D), Munich, D-81377, Grosshadern, Germany
| | - Thomas M. Klapötke
- Department of Chemistry, Ludwig-Maximilians-University Butenandtstrasse. 5-13 (Haus D), Munich, D-81377, Grosshadern, Germany
| | - Cristian Silvestru
- Faculty of Chemistry & Chemical Engineering, Babes-Bolyai University, Arany Janos str. No. 11, 400028, Cluj-Napoca, Romania
| | - Konstantin Karaghiosoff
- Department of Chemistry, Ludwig-Maximilians-University Butenandtstrasse. 5-13 (Haus D), Munich, D-81377, Grosshadern, Germany
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34
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Zheng XF, Zhu LG. Synthesis, structures and conductivity properties of silver 3-sulfobenzoate coordination polymers. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2010.09.043] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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35
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Gerasimchuk N, Gamian A, Glover G, Szponar B. Light Insensitive Silver(I) Cyanoximates As Antimicrobial Agents for Indwelling Medical Devices. Inorg Chem 2010; 49:9863-74. [DOI: 10.1021/ic100830x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Nikolay Gerasimchuk
- Department of Chemistry, Temple Hall 456, Missouri State University, Springfield, Missouri 65897
| | - Andrzej Gamian
- Ludwik Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Weigla 12, 53-114 Wroclaw, Poland
| | - Garrett Glover
- Department of Chemistry, Temple Hall 456, Missouri State University, Springfield, Missouri 65897
| | - Bogumila Szponar
- Ludwik Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Weigla 12, 53-114 Wroclaw, Poland
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