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Refat MS, Alsuhaibani AM, Eldaroti HH, Altalhi TA, El-Megharbel SM. Charge transfer complexes of cyclamate sweetener compound with vacant orbital acceptors (VCl3, RuCl3, PtCl2, SeCl4, and AuCl3): Synthesis, structural, spectroscopic, and biological studies. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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2
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Benjamin H, Müller ML, Afanasjevs S, Kamenev KV, Robertson N. Electrochemical deposition of a semiconducting gold dithiolene complex with NIR absorption. Dalton Trans 2020; 49:13786-13796. [PMID: 33000835 DOI: 10.1039/d0dt02174a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Here, the synthesis of a new anionic gold dithiolene complex, NBu4·[1-i], and that of its corresponding neutral gold complex 2 is reported. Complex 2 shows strong absorption into the IR, semiconductivity (σRT = 3.06 × 10-7 S cm-1) with an activation energy of 0.25 eV, and weakly temperature dependent paramagnetic susceptibility, indicating strong intermolecular interactions in the solid state. As a consequence of their strong intermolecular interactions, neutral gold dithiolene complexes are often highly insoluble, limiting their utility and processability. Electrochemical deposition is used to deposit conductive films of complex 2, which retain the NIR properties present in the bulk material, indicting that the strong intermolecular interactions are retained in the film.
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Affiliation(s)
- Helen Benjamin
- EaStCHEM School of Chemistry, University of Edinburgh, Edinburgh, UK.
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3
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Bechu D, Petre AM, Hosseini MW, Baudron SA. Heterometallic coordination polymers based on homo- and heteroleptic Au( iii) dithiolene complexes. CrystEngComm 2020. [DOI: 10.1039/d0ce01090a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two novel hetero- and homoleptic Au(iii) dithiolene complexes have been designed, synthesized, characterized and employed for the elaboration of heterometallic coordination networks.
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Affiliation(s)
- Damien Bechu
- Université de Strasbourg
- CNRS
- CMC UMR 7140
- Strasbourg
- France
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4
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Synthesis, spectral analysis, and thermodynamic parameters of gold(III) complex in the presence of 4-bromo-2,6-bis(hydroxymethyl)phenol and m-nitroaniline. MONATSHEFTE FUR CHEMIE 2019. [DOI: 10.1007/s00706-019-02498-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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5
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Naglah AM, Al-Omar MA, Kalmouch A, Gobouri AA, Abdel-Hafez SH, El-Megharbel SM, Refat MS. Synthesis, Spectroscopy, and Anticancer Activity of Two New Nanoscale Au(III) N4 Schiff Base Complexes. RUSS J GEN CHEM+ 2019. [DOI: 10.1134/s1070363219080255] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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6
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Altun Ö, Şuözer M. Synthesis, spectral analysis, antimicrobial, cytotoxicity, and antioxidant studies of gold(III) complex of caffeine. J COORD CHEM 2019. [DOI: 10.1080/00958972.2019.1629430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Özlen Altun
- Department of General and Inorganic Chemistry, Trakya University, Edirne, Turkey
| | - Mehtap Şuözer
- Department of General and Inorganic Chemistry, Trakya University, Edirne, Turkey
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McGuire J, Miras HN, Richards E, Sproules S. Enabling single qubit addressability in a molecular semiconductor comprising gold-supported organic radicals. Chem Sci 2019; 10:1483-1491. [PMID: 30809365 PMCID: PMC6354843 DOI: 10.1039/c8sc04500c] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Accepted: 11/21/2018] [Indexed: 01/24/2023] Open
Abstract
A bis(dithiolene)gold complex is presented as a model for an organic molecular electron spin qubit attached to a metallic surface that acts as a conduit to electrically address the qubit. A two-membered electron transfer series is developed of the formula [AuIII(adt)2]1-/0, where adt is a redox-active dithiolene ligand that is sequentially oxidized as the series is traversed while the central metal ion remains AuIII and steadfastly square planar. One-electron oxidation of diamagnetic [AuIII(adt)2]1- (1) produces an S = 1/2 charge-neutral complex, [AuIII(adt2 3-˙)] (2) which is spectroscopically and theoretically characterized with a near negligible Au contribution to the ground state. A phase memory time (T M) of 21 μs is recorded in 4 : 1 CS2/CCl4 at 10 K, which is the longest ever reported for a coordination complex possessing a third-row transition metal ion. With increasing temperature, T M dramatically decreases becoming unmeasurable above 80 K as a consequence of the diminishing spin-lattice (T 1) relaxation time fueled by spin-orbit coupling. These relaxation times are 1-2 orders of magnitude shorter for the solid dilution of 2 in isoelectronic [Ni(adt)2] because this material is a molecular semiconductor. Although the conducting properties of this material provide efficient pathways to dissipate the energy through the lattice, it can also be used to electrically address the paramagnetic dopant by tapping into the mild reduction potential to switch magnetism "on" and "off" in the gold complex without compromising the integrity of its structure. These results serve to highlight the need to consider all components of these spintronic assemblies.
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Affiliation(s)
- Jake McGuire
- WestCHEM School of Chemistry , University of Glasgow , Glasgow , G12 8QQ , UK .
| | - Haralampos N Miras
- WestCHEM School of Chemistry , University of Glasgow , Glasgow , G12 8QQ , UK .
| | - Emma Richards
- School of Chemistry , Cardiff University , Main Building, Park Place , Cardiff , CF10 3AT , UK
| | - Stephen Sproules
- WestCHEM School of Chemistry , University of Glasgow , Glasgow , G12 8QQ , UK .
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Alibrahim KA, Al-Saif FA, Bakhsh HA, Refat MS. Synthesis, Physicochemical, and Biological Studies of New Pyridoxine HCl Mononuclear Drug Complexes of V(III), Ru(III), Pt(II), Se(IV), and Au(III) Metal Ions. RUSS J GEN CHEM+ 2018. [DOI: 10.1134/s1070363218110245] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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9
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Abou Melha KSA, Al-Hazmi GAA, Refat MS. Synthesis of Nano-Metric Gold Complexes with New Schiff Bases Derived from 4-Aminoantipyrene, Their Structures and Anticancer Activity. RUSS J GEN CHEM+ 2018. [DOI: 10.1134/s1070363217120519] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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10
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Conformational behavior, redox and spectroscopic properties of gold dithiolene complexes: [Au(iPr-thiazYdt)2]−1 (Y = O, S, Se). Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.09.050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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11
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Al-Khodir FAI, Refat MS. Physicochemical, spectroscopic, and anti-tumor studies of cefradine complexes with Ca(II), Zn(II), Fe(III), Au(III), and Pd(II) ions. RUSS J GEN CHEM+ 2017. [DOI: 10.1134/s1070363217050322] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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12
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Al-Khodir FAI, Refat MS. Synthesis, spectroscopic, thermal analyses, and anti-cancer studies of metalloantibiotic complexes of Ca(II), Zn(II), Pt(II), Pd(II), and Au(III) with albendazole drug. RUSS J GEN CHEM+ 2015. [DOI: 10.1134/s1070363215070270] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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13
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Dicks JP, Zubair M, Davies ES, Garner CD, Schulzke C, Wilson C, McMaster J. Synthesis, Structure and Redox Properties of Asymmetric (Cyclopentadienyl)(ene-1,2-dithiolate)cobalt(III) Complexes Containing Phenyl, Pyridyl and Pyrazinyl Units. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500138] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Kaur G, Abramovich LA, Gazit E, Verma S. Ultrastructure of metallopeptide-based soft spherical morphologies. RSC Adv 2014. [DOI: 10.1039/c4ra10532j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Metal-mediated modification of soft spherical assemblies is reportedviaintroduction of a coordinating linker for FF dipeptide. Single crystal data, microscopy and reversal of soft structure coalescence is described.
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Affiliation(s)
- Gagandeep Kaur
- Department of Chemistry
- DST Thematic Unit of Excellence on Soft Nanofabrication
- Center for Environmental Sciences and Engineering
- Indian Institute of Technology Kanpur
- Kanpur-208016, India
| | - Lihi A. Abramovich
- Department of Molecular Biology and Biotechnology
- Department of Materials Science and Engineering
- Tel Aviv University
- Tel Aviv-69978, Israel
| | - Ehud Gazit
- Department of Molecular Biology and Biotechnology
- Department of Materials Science and Engineering
- Tel Aviv University
- Tel Aviv-69978, Israel
| | - Sandeep Verma
- Department of Chemistry
- DST Thematic Unit of Excellence on Soft Nanofabrication
- Center for Environmental Sciences and Engineering
- Indian Institute of Technology Kanpur
- Kanpur-208016, India
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16
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Ogawa T, Sakamoto M, Honda H, Matsumoto T, Kobayashi A, Kato M, Chang HC. Self-association and columnar liquid crystalline phase of cationic alkyl-substituted-bipyridine benzenedithiolato gold(III) complexes. Dalton Trans 2013; 42:15995-6005. [PMID: 23893264 DOI: 10.1039/c3dt51444g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The introduction of a Au(III) ion into a mesogenic core, [M(Bdt)(Cnbpy)](+) (Bdt = 1,2-benzenedithiolato and Cnbpy = 4,4'-di-alkyl-2,2'-bipyridine (n = 13 (4,4'-di-tridecyl-2,2'-bipyridine (C13bpy)) and 8,10 (4,4'-di-(3-octyltridecyl)-2,2'-bipyridine (C8,10bpy)))), leads to the formation of ionic molecular assemblies in crystalline and mesophases. Successive syntheses of precursor complexes, [AuCl2(Cnbpy)]PF6 (n = 13 (1) and 8,10 (2)), followed by the target complexes, [Au(Bdt)(Cnbpy)]PF6 (n = 13 (3) and 8,10 (4)), were achieved. The crystallographic analysis of 3 revealed that the central cationic cores form a characteristic one-dimensional columnar structure, which is an essential property for the formation of columnar structures in the liquid crystalline phase. The central cores of the [Au(Bdt)(C13bpy)](+) cations in 3 stack alternatively so as to cancel out their dipole moments and the counteranions lie between the cationic columns. Furthermore, the introduction of the branched alkyl tails in 4 induces the formation of a rectangular columnar liquid crystalline phase (Col(r)) with C2/m symmetry, and it melts to an isotropic liquid at 69 °C. The Col(r) phase of 4 is partially similar in its liquid crystalline structure to the neutral [Pt(Bdt)(C8,10bpy)] liquid crystal in a hexagonal columnar phase reported previously, while complex 4 shows a lower clearing point than that of the Pt analogue. Based on these results, the present study demonstrates the designability of the liquid crystalline structures of the [M(Bdt)(C8,10bpy)] skeleton together with their assembled structures and physico-chemical properties.
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Affiliation(s)
- Tomohiro Ogawa
- Department of Chemistry, Faculty of Science, Hokkaido University, North-10, West-8, Kita-ku, Sapporo 060-0810, Japan
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17
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Taylor AJ, Davies ES, Weinstein JA, Sazanovich IV, Bouganov OV, Tikhomirov SA, Towrie M, McMaster J, Garner CD. Ultrafast Intramolecular Charge Separation in a Donor–Acceptor Assembly Comprising Bis(η5-cyclopentadienyl)molybdenum Coordinated to an Ene-1,2-dithiolate-naphthalenetetracarboxylicdiimide Ligand. Inorg Chem 2012; 51:13181-94. [DOI: 10.1021/ic301436t] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Adam J. Taylor
- School of Chemistry, University of Nottingham, Nottingham NG7 2 RD, United
Kingdom
| | - E. Stephen Davies
- School of Chemistry, University of Nottingham, Nottingham NG7 2 RD, United
Kingdom
| | - Julia A. Weinstein
- Department of Chemistry, University of Sheffield, Sheffield S3 7HF, United Kingdom
| | - Igor V. Sazanovich
- Department of Chemistry, University of Sheffield, Sheffield S3 7HF, United Kingdom
| | | | | | - Michael Towrie
- Central Laser Facility, Science
and Technology Facilities Council, Rutherford Appleton Laboratory, OX11 0QX, United Kingdom
| | - Jonathan McMaster
- School of Chemistry, University of Nottingham, Nottingham NG7 2 RD, United
Kingdom
| | - C. David Garner
- School of Chemistry, University of Nottingham, Nottingham NG7 2 RD, United
Kingdom
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18
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Doménech A, Leyva-Pérez A, Al-Resayes SI, Corma A. Electrochemical monitoring of the oxidative coupling of alkynes catalyzed by triphenylphosphine gold complexes. Electrochem commun 2012. [DOI: 10.1016/j.elecom.2012.02.038] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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19
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Whalley AL, Blake AJ, Collison D, Davies ES, Disley HJ, Helliwell M, Mabbs FE, McMaster J, Wilson C, Garner CD. Synthesis, structure and redox properties of bis(cyclopentadienyl)dithiolene complexes of molybdenum and tungsten. Dalton Trans 2011; 40:10457-72. [PMID: 21785804 DOI: 10.1039/c1dt10663e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The compounds [Cp(2)M(S(2)C(2)(H)R)] (M = Mo or W; R = phenyl, pyridin-2-yl, pyridin-3-yl, pyridin-4-yl or quinoxalin-2-yl) and [Cp(2)Mo(S(2)C(2)(Me)(pyridin-2-yl)] have been prepared by a facile and general route for the synthesis of dithiolene complexes, viz. the reaction of [Cp(2)MCl(2)] (M = Mo or W) with the dithiolene pro-ligand generated by reacting the corresponding 4-(R)-1,3-dithiol-2-one with CsOH. These Mo compounds were reported previously (Hsu et al., Inorg. Chem. 1996, 35, 4743); however, the preparative method employed herein is more versatile and generates the compounds in good yield and all of the W compounds are new. Electrochemical investigations have shown that each compound undergoes a diffusion controlled one-electron oxidation (OX(I)) and a one-electron reduction (RED(I)) process; each redox change occurs at a more positive potential for a Mo compound than for its W counterpart. The mono-cations generated by chemical or electrochemical oxidation are stable and the structures of both components of the [Cp(2)Mo(S(2)C(2)(H)R)](+)/[Cp(2)Mo(S(2)C(2)(H)R)] (R = Ph or pyridin-3-yl) redox couples have been determined by X-ray crystallography. For each redox related pair, the changes in the Mo-S, S-C and C-C bond lengths of the {MoSCCS} moiety are generally consistent with OX(I) involving the loss of an electron from a π-orbital that is Mo-S and C-S antibonding and C-C bonding in character. These results have been interpreted successfully within the framework provided by DFT calculations accomplished for [Cp(2)M(S(2)C(2)(H)Ph)](n) (M = Mo or W; n = +1, 0 or -1). The HOMO of the neutral compounds is derived mainly from the dithiolene π(3) orbital (65%); therefore, OX(I) is essentially a dithiolene-based process. The similarity of the potentials for OX(I) (ca. 30 mV) for analogous Mo and W compounds is consistent with this interpretation and the EPR spectra of each of the Mo cations show that the unpaired electron is coupled to the dithiolene proton but relatively weakly to (95,97)Mo. The DFT calculations indicate that the unpaired electron is more localised on the metal in the mono-anions than in the mono-cations. In agreement with this, the EPR spectrum of each of the Mo-containing mono-anions manifests a larger (95,97)Mo coupling (A(iso)) than observed for the corresponding mono-cation and RED(I) for a W compound is significantly (ca. 300 mV) more negative than that of its Mo counterpart. [Cp(2)W(S(2)C(2)(H)(quinoxalin-2-yl))] is anomalous; RED(I) occurs at a potential ca. 230 mV more positive than expected from that of its Mo counterpart and the EPR spectrum of the mono-anion is typical of an organic radical. DFT calculations indicate that these properties arise because the electron is added to a quinoxalin-2-yl π-orbital.
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Affiliation(s)
- Alexandra L Whalley
- School of Chemistry, The University of Nottingham, University Park, Nottingham, UK NG7 2RD
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20
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Perochon R, Davidson P, Rouzière S, Camerel F, Piekara-Sady L, Guizouarn T, Fourmigué M. Probing magnetic interactions in columnar phases of a paramagnetic gold dithiolene complex. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c0jm02171g] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Dalgleish S, Labram JG, Li Z, Wang J, McNeill CR, Anthopoulos TD, Greenham NC, Robertson N. Indole-substituted nickel dithiolene complexes in electronic and optoelectronic devices. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm12466h] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Aragoni MC, Arca M, Devillanova FA, Isaia F, Lippolis V, Pintus A. Gold(III) Complexes of Asymmetrically Aryl-Substituted 1,2-Dithiolene Ligands Featuring Potential-Controlled Spectroscopic Properties: An Insight into the Electronic Properties of bis(Pyren-1-yl-ethylene-1,2-dithiolato)Gold(III). Chem Asian J 2010; 6:198-208. [DOI: 10.1002/asia.201000525] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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23
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Rabaça S, Almeida M. Dithiolene complexes containing N coordinating groups and corresponding tetrathiafulvalene donors. Coord Chem Rev 2010. [DOI: 10.1016/j.ccr.2009.12.006] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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24
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Ambrosio L, Aragoni MC, Arca M, Devillanova F, Hursthouse M, Huth S, Isaia F, Lippolis V, Mancini A, Pintus A. Synthesis and Characterization of Novel Gold(III) Complexes of Asymmetrically Aryl-Substituted 1,2-Dithiolene Ligands Featuring Potential-Controlled Spectroscopic Properties. Chem Asian J 2010; 5:1395-406. [DOI: 10.1002/asia.200900690] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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25
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Bis[1,2-diphenyl-1,2-ethylenedithiolato(2-)-kS1,kS2] gold: Preparation, structure and properties. Polyhedron 2009. [DOI: 10.1016/j.poly.2009.05.045] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Rabaça S, Cerdeira AC, Neves AI, Dias SI, Mézière C, Santos IC, Pereira LC, Fourmigué M, Henriques RT, Almeida M. Complexes based on asymmetrically substituted pyridine–dithiolene ligands [M(4-pedt)2] (M=Au, Cu, Ni; 4-pedt=1-(pyridin-4-yl)-ethylene-1,2-dithiolate): Synthesis, structure and physical properties. Polyhedron 2009. [DOI: 10.1016/j.poly.2009.01.015] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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27
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Perochon R, Piekara-Sady L, Jurga W, Clérac R, Fourmigué M. Amphiphilic paramagnetic neutral gold dithiolene complexes. Dalton Trans 2009:3052-61. [DOI: 10.1039/b820819k] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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28
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Rabaça S, Belo D, Cláudia Cerdeira A, Isabel Godinho Dias S, Berkemeier Castelo Branco M, Cristina Jesus Pereira L, Cordeiro Santos I, Fourmigué M, Almeida M. Crystal structure of (RBzPy)n[Ni(4-pedt)2] salts engineering by pyridine ring arrangements. CrystEngComm 2009. [DOI: 10.1039/b906594f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Madhu V, Das SK. New series of asymmetrically substituted Bis(1,2-dithiolato)-nickel(III) complexes exhibiting near IR absorption and structural diversity. Inorg Chem 2008; 47:5055-70. [PMID: 18479121 DOI: 10.1021/ic701408m] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
The synthesis, structural characterization, and properties of a new series of asymmetrically substituted bis(dithiolene) nickel(III) compounds [Bu4N][Ni(Phdt)2] (1) (Phdt = 2-Phenyl-1,2-dithiolate), [Bu4N][Ni(NO2Phdt)2] (2) (NO2Phdt = 2-( p-nitrophenyl)-1,2-dithiolate), [Bu4N][Ni(FPhdt)2] (3) (FPhdt = 2-( p-fluorophenyl)-1,2-dithiolate), [Bu4N][Ni(ClPhdt)2] (4) (ClPhdt = 2-( p-chlorophenyl)-1,2-dithiolate), and [Bu4N][Ni(BrPhdt)2] (5) (BrPhdt = 2-( p-bromophenyl)-1,2-dithiolate) have been described. All complexes 1- 5 exhibit absorptions in the near-infrared region; the shift of these absorption bands can be tuned by the choice of the substituents on the relevant dithiolene moieties. The substituents on the dithiolene moiety are also responsible for their structural diversities. The nature of the substituents on the dithiolene moiety play an important role in tuning the redox potentials along this series. The nitro derivative (compound 2) exhibits several redox couples in its cyclic voltammogram in contrast to the other compounds in this series. The synthesis and characterization of two asymmetrically halogen substituted tetrathiafulvalene (TTF) derivatives 4,4'-bis(4-chlorophenyl)-tetrathiafulvalene ClPhTTF (6) and 4,4'-bis(4-bromophenyl)-tetrathiafulvalene (BrPhTTF) (7) have been described. One of these compounds has been structurally characterized. Iodine treatment of the monoanionic Ni(III) compound [Bu4N][Ni(ClPhdt)2] (4) results in the formation of a neutral Ni(IV) complex [Ni(ClPhdt)2] (8). All monoanionic compounds 1- 5 are Ni(III) complexes, as evidenced by electron spin resonance spectroscopy. Interestingly, strong Cl...Cl interactions are observed in the solid state structures of the chlorinated compounds 6 and 8. Finally, the structural features of compound [Ni(ClPhdt)2] (8) and the TTF derivative ClPhTTF (6) are compared based on their enormous structural similarities, and the neutral compound [Ni(ClPhdt)2] (8) is classed as the "an inorganic counterpart of TTF".
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Affiliation(s)
- Vedichi Madhu
- School of Chemistry, University of Hyderabad, Hyderabad, India
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Kokatam S, Ray K, Pap J, Bill E, Geiger WE, LeSuer RJ, Rieger PH, Weyhermüller T, Neese F, Wieghardt K. Molecular and electronic structure of square-planar gold complexes containing two 1,2-Di(4-tert-butylphenyl)ethylene-1,2-dithiolato ligands: [Au(2L)2]1+/0/1-/2-. A combined experimental and computational study. Inorg Chem 2007; 46:1100-11. [PMID: 17291110 DOI: 10.1021/ic061181u] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
From the reaction of in situ generated 1,2-di(4-tert-butylphenyl)ethylene-1,2-dithiol, 2LH2, and Na[AuCl4].2H2O in 1,4-dioxane, green brown crystals of diamagnetic [N(n-Bu)4][AuIII(2L)2] (1) were obtained. As shown by cyclic voltammetry, 1 is a member of an electron-transfer series comprising the dianion [AuII(2L)2]2-, the monoanion [AuIII(2L)2]-, the neutral species [AuIII(2L*)(2L)]0 <--> [AuIII(2L)(2L*)]0, and the monocation [AuIII(2L*)2]+. (2L*)1- represents the pi radical anion (Srad = 1/2) of the one-electron oxidized closed-shell dianion (2L)2-. Oxidation of 1 in CH2Cl2 with ferrocenium hexafluorophosphate affords green, paramagnetic microcrystals of [AuIII(2L*)(2L)] <--> [AuIII(2L)(2L*)] (2) (S = 1/2). Complexes 1 and 2 have been characterized by X-ray crystallography. Both species possess square-planar monoanions and neutral molecules, respectively. From the oxidation reaction of 1 or [N(n-Bu)4][AuIII(3L)2] with 2-3 equiv of [NO]BF4 in CH2Cl2, a green solution of [AuIII(2L*)2]+ and green microcrystals of [AuIII(3L*)2]BF4 (3) were obtained, respectively; (3L)2- represents the dianion 1,2-di(4-diphenyl)ethylene-1,2-dithiolate, and (3L*)1- is its pi radical monoanion. The electronic structures of this series of gold species have been elucidated by UV-vis, EPR spectroscopies, and DFT calculations. It is shown computationally by density functional theoretical (DFT) methods that the electronic structure of [AuIII(1L*)2]+ is best described as a singlet diradical (St = 0); the ligand mixed valency in the neutral species 2 is of class (III) (delocalized); the monoanion in 1 contains a AuIII ion and two closed-shell dianionic ligands; and the corresponding dianions [Au(L)2]2- are best described as an intermediate AuII/AuIII species with a metal-ligand delocalized SOMO (25% Au 5d, 75% 3p of four S atoms). (1L)2- is the dianion 1,2-di(phenyl)ethylene-1,2-dithiolate, and (1L*)1- is the pi radical monoanion. The neutral species [PdII(2L*)2] (4) has also been synthesized and characterized by X-ray crystallography. Its electronic structure is the same as described for [AuIII(1L*)2]+ (singlet diradical), whereas that of the monoanion [PdII(2L*)(2L)]- <--> [Pd(2L)(2L*)]- corresponds to that of the neutral gold complex 2. Anodic oxidation of the analogous monoanion [AuIII(mnt)2]-, where mnt = maleonitriledithiolate, gave the neutral complex [Au(mnt)(mnt*)] (E1/2 = 0.91 V vs Fc+/Fc). The optical and EPR spectroscopies of [Au(mnt)(mnt*)] were consistent with those observed for the corresponding di(tert-butylphenyl)ethylenedithiolate complex 2.
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Affiliation(s)
- Swarnalatha Kokatam
- Max-Planck-Institut für Bioanorganische Chemie, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
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Baudron SA, Hosseini MW, Kyritsakas N, Kurmoo M. A stepwise approach to the formation of heterometallic discrete complexes and infinite architectures. Dalton Trans 2007:1129-39. [PMID: 17339996 DOI: 10.1039/b616841h] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A strategy for the controlled construction of heterobimetallic discrete complexes and 1-D coordination networks is presented. The organic ligand based on the methanedithiolate group and the 4,5-diazafluorene moiety behaving as primary and secondary coordination poles respectively leads to the formation of a series of discrete metal complexes with various geometries via binding through the dithiolate site. The observed coordination geometries range from square-planar for Ni(ii) and Pd(ii) to distorted tetrahedral for Zn(ii) and Hg(ii). The square-planar Pd(ii) complex affords a discrete bimetallic trinuclear complex when treated with a capped Ni(ii) center. All three Ni(ii), Pd(ii) and Hg(ii) discrete complexes have been also shown to behave as metallatectons leading to the generation of infinite networks in the presence of bridging cations such as sodium.
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Affiliation(s)
- Stéphane A Baudron
- Laboratoire de Chimie de Coordination Organique (UMR 7140), Université Louis Pasteur, Institut Le Bel, 4 rue Blaise Pascal, 67000, Strasbourg, France.
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Periyasamy G, Burton NA, Hillier IH, Vincent MA, Disley H, McMaster J, Garner CD. The dithioleneligand—‘innocent’ or ‘non-innocent’? A theoretical and experimental study of some cobalt–dithiolene complexes. Faraday Discuss 2007; 135:469-88; discussion 489-506. [PMID: 17328443 DOI: 10.1039/b607144a] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
As Jørgensen pointed out in 1966 (Coord. Chem. Rev., 1966, 1, 164), a ligand is to be regarded as 'innocent' if it allows the oxidation state of a metal in a complex to be defined. In this respect, the vast majority of ligands are 'innocent' and, therefore, ligands that are 'non-innocent' have received special attention. Dithiolenes have been regarded as 'non-innocent' ligands since it is possible to consider a ligand of this type to be present in a complex as either: (i) an ene-1,2-dithiolate dianion or (ii) a neutral dithioketone. On this basis, the electronic structure of a dithiolene complex can be described by a set of resonance structures, each of which involves the dithiolene in one of the two forms with the oxidation state of the metal centre being adjusted accordingly. The relative importance of these structures is expected to be reflected in the corresponding molecular structure and spectroscopic properties. In this paper we present a theoretical study of the pair of related 5-cyclopentadienyl cobalt dithiolene complexes, [CpCo(S2C2(H)Ph)] and [CpCo(S2C2(H)Ph)(PMe3)]. Density functional theory calculations successfully predict their different structures and NMR chemical shifts, which we have measured. These wavefunctions have been analysed, particularly in terms of Natural Bond Orbitals and Nucleus Independent Chemical Shifts in an attempt to understand how "innocence" or otherwise is reflected in the experimental data. To this end, a similar analysis is applied to the gold complexes [Au(S2C2(H)Ph)2] and [Au(S2C2(H)Ph)2].
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Affiliation(s)
- Ganga Periyasamy
- School of Chemistry, University of Manchester, Manchester, UK M13 9PL
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Baudron SA, Hosseini MW. Sequential Generation of One-Dimensional Networks Based on a Differentiated Bischelate-Type Ligand Bearing Both 4,5-Diazafluorene and Dithiolene Units. Inorg Chem 2006; 45:5260-2. [PMID: 16813382 DOI: 10.1021/ic0603510] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel dithiolene ligand appended with a 4,5-diazafluorene moiety has been synthesized and used for the preparation of discrete nickel and mercury complexes and a one-dimensional polymer in the presence of sodium cations.
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Affiliation(s)
- Stéphane A Baudron
- Laboratoire de Chimie de Coordination Organique, UMR CNRS 7140, Université Louis Pasteur, F-67000 Strasbourg, France.
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Jeannin O, Fourmigu? M. Perylene salts of unsymmetrical nickel and gold dithiolene complexes with 3 ? 2 stoichiometry: conformational polymorphism and strong antiferromagnetic interactions. NEW J CHEM 2006. [DOI: 10.1039/b608420f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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