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Sailer R, VandeVen W, Teindl K, Chiang L. Ni II and Cu II complexes of a salen ligand bearing ferrocenes in its secondary coordination sphere. RSC Adv 2023; 13:7293-7299. [PMID: 36891492 PMCID: PMC9986886 DOI: 10.1039/d2ra07671c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Accepted: 02/24/2023] [Indexed: 03/08/2023] Open
Abstract
Herein, we report the synthesis, spectroscopic characterization and electrochemical investigation of the NiII and CuII complexes of a novel Sal ligand bearing two ferrocene moieties attached at its diimine linker, M(Sal)Fc. The electronic spectra of M(Sal)Fc are near identical to its phenyl-substituted counterpart, M(Sal)Ph, indicating the ferrocene moieties exist in the secondary coordination sphere of M(Sal)Fc. The cyclic voltammograms of M(Sal)Fc exhibit an additional two-electron wave in comparison to M(Sal)Ph, which is assigned to the sequential oxidation of the two ferrocene moieties. The chemical oxidation of M(Sal)Fc, monitored by low temperature UV-vis spectroscopy, supports the formation of a mixed valent FeIIFeIII species followed by a bis(ferrocenium) species upon sequential addition of one and two equivalents of chemical oxidant. The addition of a third equivalent of oxidant to Ni(Sal)Fc yielded intense near-IR transitions that are indicative of the formation of a fully delocalized Sal-ligand radical (Sal˙), while the same addition to Cu(Sal)Fc yielded a species that is currently under further spectroscopic investigation. These results suggest the oxidation of the ferrocene moieties of M(Sal)Fc does not affect the electronic structure of the M(Sal) core, and these are thus in the secondary coordination sphere of the overall complex.
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Affiliation(s)
- Rachel Sailer
- Department of Chemistry, University of the Fraser Valley Abbotsford V2S 7M8 British Columbia Canada
| | - Warren VandeVen
- Department of Chemistry, Simon Fraser University Burnaby V5A 1S6 British Columbia Canada
| | - Kaeden Teindl
- Department of Chemistry, University of the Fraser Valley Abbotsford V2S 7M8 British Columbia Canada
| | - Linus Chiang
- Department of Chemistry, University of the Fraser Valley Abbotsford V2S 7M8 British Columbia Canada
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Hernández-Pacheco P, Zelada-Guillén GA, Romero-Ávila M, Cañas-Alonso RC, Flores-Álamo M, Escárcega-Bobadilla MV. Enhanced Host-Guest Association and Fluorescence in Copolymers from Copper Salphen Complexes by Supramolecular Internalization of Anions. Chempluschem 2023; 88:e202200310. [PMID: 36175158 DOI: 10.1002/cplu.202200310] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 09/13/2022] [Indexed: 11/10/2022]
Abstract
We describe the synthesis, crystallographic characterization of a new Cu-Salphen compound and its use as a host Lewis-acid against guest anions in two versions: a) free molecule, b) copolymerized with methyl methacrylate:n-butyl acrylate (1 : 4-wt.) as protective co-monomers. Higher contents in Cu-Salphen yielded larger and more homogeneous polymer sizes. Polymer size together with glass transitions, heat capacity, thermal degradation, guest-saturation degrees and host-guest species distribution profiles from spectrophotometric titrations explained growths of up to 630-fold in K11 and 180000-fold in K12 for the host's binding site attributable to a solvophobic protection from the macromolecular structure. Spectrofluorimetry revealed blue-shifted×13-16 larger luminescence for Cu-Salphen in the polymers (λem =488-498 nm) than that of the non-polymerized counterpart (λem =510-543 nm) and "turn-on" blue-shifted enhanced fluorescence upon guest association. We propose a cooperative incorporation of the guests occurring from the outer medium toward internally protected binding site pockets in the random coil polymer conformations.
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Affiliation(s)
- Paulina Hernández-Pacheco
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City, 04510, Mexico
| | - Gustavo A Zelada-Guillén
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City, 04510, Mexico
| | - Margarita Romero-Ávila
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City, 04510, Mexico
| | - Roberto Carlos Cañas-Alonso
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City, 04510, Mexico
| | - Marcos Flores-Álamo
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City, 04510, Mexico
| | - Martha V Escárcega-Bobadilla
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City, 04510, Mexico
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Baryshnikova SV, Poddel’sky AI. Heteroligand Metal Complexes with Extended Redox Properties Based on Redox-Active Chelating Ligands of o-Quinone Type and Ferrocene. Molecules 2022; 27:molecules27123928. [PMID: 35745052 PMCID: PMC9230781 DOI: 10.3390/molecules27123928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2022] [Revised: 06/13/2022] [Accepted: 06/17/2022] [Indexed: 12/10/2022] Open
Abstract
A combination of different types of redox-active systems in one molecule makes it possible to create coordination compounds with extended redox abilities, combining molecular and electronic structures determined by the features of intra- and intermolecular interactions between such redox-active centres. This review summarizes and analyses information from the literature, published mainly from 2000 to the present, on the methods of preparation, the molecular and electronic structure of mixed-ligand coordination compounds based on redox-active ligands of the o-benzoquinone type and ferrocenes, ferrocene-containing ligands, the features of their redox properties, and some chemical behaviour.
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Lacaze M, Saffon-Merceron N, Silly F, Bonvoisin J. Synthesis and characterization of iodo derivatives of bis-salphen complexes. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2020.129319] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Zelada-Guillén GA, Hernández-Pacheco P, Romero-Ávila M, Cañas-Alonso RC, Flores-Álamo M, Escárcega-Bobadilla MV. Acrylic Polymers Containing a Nickel Salphen Complex: An Approach to Supramolecular and Macromolecular Systems. Chempluschem 2020; 85:2546-2556. [PMID: 32945594 DOI: 10.1002/cplu.202000471] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 08/21/2020] [Indexed: 11/10/2022]
Abstract
The synthesis, characterization and crystallographic analysis is reported of a new Nickel Salphen complex and its radical copolymerization with n-butyl acrylate and methyl methacrylate to produce novel host macromolecules with tunable association against guest anions. Spectrophotometric titrations of the complex and of the polymers revealed that a supramolecular regulation of guest-binding accessibility was enabled by the number of Ni-Salphen units per chain. The latter content in turn, determined the chain size and molecular weight uniformity upon polymerization, and likely increased the strength in interchain/intrachain non-covalent interactions over the nickel center and the acrylic domains. The study also showed that incorporation of the monomer into the acrylic polymer backbone opened the possibility for the nickel binding site to gain access to host:guest stoichiometric discrimination, switching from 1 : 1 (major) and 1 : 2 (minor) both coexisting for the host when in the free form, to mostly 1 : 2 when in the polymerized version.
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Affiliation(s)
- Gustavo A Zelada-Guillén
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City, 04510, Mexico
| | - Paulina Hernández-Pacheco
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City, 04510, Mexico
| | - Margarita Romero-Ávila
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City, 04510, Mexico
| | - Roberto Carlos Cañas-Alonso
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City, 04510, Mexico
| | - Marcos Flores-Álamo
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City, 04510, Mexico
| | - Martha V Escárcega-Bobadilla
- School of Chemistry, National Autonomous University of Mexico (UNAM), Circuito Escolar s/n, Ciudad Universitaria, Mexico City, 04510, Mexico
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Gualandi A, Marchini M, Mengozzi L, Kidanu HT, Franc A, Ceroni P, Cozzi PG. Aluminum(III) Salen Complexes as Active Photoredox Catalysts. European J Org Chem 2019. [DOI: 10.1002/ejoc.201901086] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Andrea Gualandi
- Dipartimento di Chimica “G. Ciamician”; Alma Mater Studiorum - Università di Bologna; Via Selmi 2 40126 Bologna Italy
| | - Marianna Marchini
- Dipartimento di Chimica “G. Ciamician”; Alma Mater Studiorum - Università di Bologna; Via Selmi 2 40126 Bologna Italy
| | - Luca Mengozzi
- Dipartimento di Chimica “G. Ciamician”; Alma Mater Studiorum - Università di Bologna; Via Selmi 2 40126 Bologna Italy
| | - Hagos Tesfay Kidanu
- Dipartimento di Chimica “G. Ciamician”; Alma Mater Studiorum - Università di Bologna; Via Selmi 2 40126 Bologna Italy
| | - Antoine Franc
- Dipartimento di Chimica “G. Ciamician”; Alma Mater Studiorum - Università di Bologna; Via Selmi 2 40126 Bologna Italy
- École nationale supérieure de chimie de Paris; 11, rue Pierre et Marie Curie 75231 Paris Cedex 05 France
| | - Paola Ceroni
- Dipartimento di Chimica “G. Ciamician”; Alma Mater Studiorum - Università di Bologna; Via Selmi 2 40126 Bologna Italy
| | - Pier Giorgio Cozzi
- Dipartimento di Chimica “G. Ciamician”; Alma Mater Studiorum - Università di Bologna; Via Selmi 2 40126 Bologna Italy
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Al(Salen) Metal Complexes in Stereoselective Catalysis. Molecules 2019; 24:molecules24091716. [PMID: 31052604 PMCID: PMC6540592 DOI: 10.3390/molecules24091716] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Revised: 04/29/2019] [Accepted: 04/30/2019] [Indexed: 11/17/2022] Open
Abstract
Salen ligands are a class of Schiff bases simply obtained through condensation of two molecules of a hydroxyl-substituted aryl aldehyde with an achiral or chiral diamine. The prototype salen, or N,N'-bis(salicylidene)ethylenediamine has a long history, as it was first reported in 1889, and immediately, some of its metal complexes were also described. Now, the salen ligands are a class of N,N,O,O tetradentate Schiff bases capable of coordinating many metal ions. The geometry and the stereogenic group inserted in the diamine backbone or aryl aldehyde backbone have been utilized in the past to efficiently transmit chiral information in a variety of different reactions. In this review we will summarize the important and recent achievements obtained in stereocontrolled reactions in which Al(salen) metal complexes are employed. Several other reviews devoted to the general applications and synthesis of chromium and other metal salens have already been published.
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Gmelin‐Beilstein‐Denkmünze: R. Deplanque / Meyer‐Galow‐Preis: M. Rarbach / Internationale Preise der Königlich Spanischen Chemischen Gesellschaft: P. Knochel und P. G. Cozzi. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201812831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Gmelin–Beilstein Memorial Medal: R. Deplanque / Meyer‐Galow Prize: M. Rarbach / International Prizes from the Real Sociedad Española de Química: P. Knochel and P. G. Cozzi. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/anie.201812831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Preise der Französischen Chemischen Gesellschaft 2018: J. A. Baceiredo, P. Samorì, P. Knochel, Z. Shuai, F. Lloret Pastor, A. J. L. Pombeiro / Sir William Grove Award: P. Strasser / Jaroslav‐Heyrovsky‐Preis: S. Waldvogel. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201811647] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Société Chimique de France Prizes 2018: J. A. Baceiredo, P. Samorì, P. Knochel, Z. Shuai, F. Lloret Pastor, A. J. L. Pombeiro / Sir William Grove Award: P. Strasser / Jaroslav Heyrovsky Prize: S. Waldvogel. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/anie.201811647] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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