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Myers TW, Brown KE, Chavez DE, Scharff RJ, Veauthier JM. Laser Initiation of Fe(II) Complexes of 4-Nitro-pyrazolyl Substituted Tetrazine Ligands. Inorg Chem 2017; 56:2297-2303. [DOI: 10.1021/acs.inorgchem.6b02998] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Thomas W. Myers
- M Division and ‡Chemistry Division, Los Alamos National Laboratory, P.O. Box 1663, Los
Alamos, New Mexico 87544, United States
| | - Kathryn E. Brown
- M Division and ‡Chemistry Division, Los Alamos National Laboratory, P.O. Box 1663, Los
Alamos, New Mexico 87544, United States
| | - David E. Chavez
- M Division and ‡Chemistry Division, Los Alamos National Laboratory, P.O. Box 1663, Los
Alamos, New Mexico 87544, United States
| | - R. Jason Scharff
- M Division and ‡Chemistry Division, Los Alamos National Laboratory, P.O. Box 1663, Los
Alamos, New Mexico 87544, United States
| | - Jacqueline M. Veauthier
- M Division and ‡Chemistry Division, Los Alamos National Laboratory, P.O. Box 1663, Los
Alamos, New Mexico 87544, United States
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2
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Ansari MA, Mandal A, Beyer K, Paretzki A, Schwederski B, Kaim W, Lahiri GK. Non-innocence and mixed valency in tri- and tetranuclear ruthenium complexes of a heteroquinone bridging ligand. Dalton Trans 2017; 46:15589-15598. [DOI: 10.1039/c7dt03509h] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The potential of a heteroquinone to bridge up to four metal fragments has been structurally elucidated and multiple redox processes have been ascertained.
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Affiliation(s)
- Mohd. Asif Ansari
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
| | - Abhishek Mandal
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
| | - Katharina Beyer
- Institut für Anorganische Chemie
- Universität Stuttgart
- D-70550 Stuttgart
- Germany
| | - Alexa Paretzki
- Institut für Anorganische Chemie
- Universität Stuttgart
- D-70550 Stuttgart
- Germany
| | | | - Wolfgang Kaim
- Institut für Anorganische Chemie
- Universität Stuttgart
- D-70550 Stuttgart
- Germany
| | - Goutam Kumar Lahiri
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
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3
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Myers TW, Chavez DE, Hanson SK, Scharff RJ, Scott BL, Veauthier JM, Wu R. Independent Control of Optical and Explosive Properties: Pyrazole–Tetrazine Complexes of First Row Transition Metals. Inorg Chem 2015; 54:8077-86. [DOI: 10.1021/acs.inorgchem.5b01313] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Thomas W. Myers
- M Division, ‡Chemistry Division, §Materials Physics and Applications, and ∥Bioscience Division, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545, United States
| | - David E. Chavez
- M Division, ‡Chemistry Division, §Materials Physics and Applications, and ∥Bioscience Division, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545, United States
| | - Susan K. Hanson
- M Division, ‡Chemistry Division, §Materials Physics and Applications, and ∥Bioscience Division, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545, United States
| | - R. Jason Scharff
- M Division, ‡Chemistry Division, §Materials Physics and Applications, and ∥Bioscience Division, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545, United States
| | - Brian L. Scott
- M Division, ‡Chemistry Division, §Materials Physics and Applications, and ∥Bioscience Division, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545, United States
| | - Jacqueline M. Veauthier
- M Division, ‡Chemistry Division, §Materials Physics and Applications, and ∥Bioscience Division, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545, United States
| | - Ruilian Wu
- M Division, ‡Chemistry Division, §Materials Physics and Applications, and ∥Bioscience Division, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545, United States
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4
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Quinton C, Alain-Rizzo V, Dumas-Verdes C, Clavier G, Vignau L, Audebert P. Triphenylamine/tetrazine based π-conjugated systems as molecular donors for organic solar cells. NEW J CHEM 2015. [DOI: 10.1039/c5nj02097b] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Conjugated systems built by connecting one electron-donor triphenylamine to an electron-withdrawing tetrazine have been prepared using various linkers.
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5
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Ohno K, Fujihara T, Nagasawa A. Formation of boron, nickel(II) and iridium(III) complexes with an azophenine derivative: Isomerization, delocalization and extension of the π-conjugated system on coordination. Polyhedron 2014. [DOI: 10.1016/j.poly.2014.07.030] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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6
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Cattaneo M, Vergara MM, García Posse ME, Fagalde F, Parella T, Katz NE. Spectroscopic, electrochemical and computational studies of rhenium(I) and ruthenium(II) complexes incorporating the novel tetradentate ligand 1,4-bis(4-(4′-methyl)-2,2′-bipyridyl)-2,3-diaza-1,3-butadiene (BBDB) and its derivatives. Polyhedron 2014. [DOI: 10.1016/j.poly.2013.12.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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7
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Yip JHK, Wu J, Wong KY, Ho KP, Pun CSN, Vittal JJ. Electronic Communications Mediated by Metal Clusters. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200400180] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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8
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9
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Agarwala H, Scherer TM, Maji S, Mondal TK, Mobin SM, Fiedler J, Urbanos FA, Jiménez-Aparicio R, Kaim W, Lahiri GK. Correspondence of RuIIIRuII and RuIVRuIII Mixed Valent States in a Small Dinuclear Complex. Chemistry 2012; 18:5667-75. [DOI: 10.1002/chem.201103618] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2011] [Indexed: 11/10/2022]
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10
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Parimal K, Vyas S, Chen CH, Hadad CM, Flood AH. Bond elongation in the anion radical of coordinated tetrazine ligands: A crystallographic, spectroscopic and computational study of a reduced {Re(CO)3Cl} complex. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2011.05.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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11
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Mixed-valency with cyanides as terminal ligands: Diruthenium(III,II) complexes with the 3,6-bis(2-pyridyl)-1,2,4,5-tetrazine bridge and variable co-ligands (CN− vs. bpy or NH3). Inorganica Chim Acta 2010. [DOI: 10.1016/j.ica.2009.09.018] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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12
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McNitt KA, Parimal K, Share AI, Fahrenbach AC, Witlicki EH, Pink M, Bediako DK, Plaisier CL, Le N, Heeringa LP, Griend DAV, Flood AH. Reduction of a Redox-Active Ligand Drives Switching in a Cu(I) Pseudorotaxane by a Bimolecular Mechanism. J Am Chem Soc 2009; 131:1305-13. [DOI: 10.1021/ja8085593] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kristy A. McNitt
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, and Department of Chemistry and Biochemistry, Calvin College, Grand Rapids, Michigan 49546
| | - Kumar Parimal
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, and Department of Chemistry and Biochemistry, Calvin College, Grand Rapids, Michigan 49546
| | - Andrew I. Share
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, and Department of Chemistry and Biochemistry, Calvin College, Grand Rapids, Michigan 49546
| | - Albert C. Fahrenbach
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, and Department of Chemistry and Biochemistry, Calvin College, Grand Rapids, Michigan 49546
| | - Edward H. Witlicki
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, and Department of Chemistry and Biochemistry, Calvin College, Grand Rapids, Michigan 49546
| | - Maren Pink
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, and Department of Chemistry and Biochemistry, Calvin College, Grand Rapids, Michigan 49546
| | - D. Kwabena Bediako
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, and Department of Chemistry and Biochemistry, Calvin College, Grand Rapids, Michigan 49546
| | - Christina L. Plaisier
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, and Department of Chemistry and Biochemistry, Calvin College, Grand Rapids, Michigan 49546
| | - Nga Le
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, and Department of Chemistry and Biochemistry, Calvin College, Grand Rapids, Michigan 49546
| | - Lee P. Heeringa
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, and Department of Chemistry and Biochemistry, Calvin College, Grand Rapids, Michigan 49546
| | - Douglas A. Vander Griend
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, and Department of Chemistry and Biochemistry, Calvin College, Grand Rapids, Michigan 49546
| | - Amar H. Flood
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, and Department of Chemistry and Biochemistry, Calvin College, Grand Rapids, Michigan 49546
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Alborés P, Rentschler E. “Structural and magnetic characterization of a 1D chain of [Co(II)2(μ-aqua)(μ-carboxylate)2] strung cores”. Dalton Trans 2009:2609-15. [DOI: 10.1039/b820594a] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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Kaim W, Lahiri GK. Unconventional mixed-valent complexes of ruthenium and osmium. Angew Chem Int Ed Engl 2007; 46:1778-96. [PMID: 17323423 DOI: 10.1002/anie.200602737] [Citation(s) in RCA: 307] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Recent developments have helped to extend the repertoire of mixed-valent ruthenium and osmium complexes beyond conventional systems. This extension has been achieved by using sophisticated ligands and by creating more variegated coordination patterns. The strategies employed include the use of multidentate ligands (which give rise to multinuclear and chelate complexes) and the use several redox active components (non-innocent ligands and oxidation-state ambivalence). The results offer enhanced chemical insight into metal-ligand electron-transfer situations and suggest that mixed-valent materials may eventually be exploited in molecular electronics and molecular computing.
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Affiliation(s)
- Wolfgang Kaim
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70550 Stuttgart, Germany.
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15
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El-Qisairi AK. Synthesis, characterization and semiempirical calculations of mercury(II) complexes of 3,6-bis(2′-pyridyl)-1,2,4,5-tetrazine. J COORD CHEM 2007. [DOI: 10.1080/00958970601001890] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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16
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Kaim W, Lahiri G. Unkonventionelle gemischtvalente Komplexe des Rutheniums und Osmiums. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200602737] [Citation(s) in RCA: 114] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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17
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Yuste C, Bentama A, Stiriba SE, Armentano D, De Munno G, Lloret F, Julve M. Ligand effects on the structures and magnetic properties of tricyanomethanide-containing copper(ii) complexes. Dalton Trans 2007:5190-200. [PMID: 17985027 DOI: 10.1039/b709233d] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Consuelo Yuste
- Instituto de Ciencia Molecular (ICMOL), Universitat de València, Polígono La Coma s/n, 46980 Paterna, València, Spain
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18
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Cattaneo M, Fagalde F, Katz NE, Leiva AM, Schmehl R. Enhancement of Metal−Metal Coupling at a Considerable Distance by Using 4-Pyridinealdazine as a Bridging Ligand in Polynuclear Complexes of Rhenium and Ruthenium. Inorg Chem 2005; 45:127-36. [PMID: 16390048 DOI: 10.1021/ic051312b] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Novel polynuclear complexes of rhenium and ruthenium containing PCA (PCA = 4-pyridinecarboxaldehyde azine or 4-pyridinealdazine or 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene) as a bridging ligand have been synthesized as PF(6-) salts and characterized by spectroscopic, electrochemical, and photophysical techniques. The precursor mononuclear complex, of formula [Re(Me(2)bpy)(CO)(3)(PCA)](+) (Me(2)bpy = 4,4'-dimethyl-2,2'-bipyridine), does not emit at room temperature in CH(3)CN, and the transient spectrum found by flash photolysis at lambda(exc) = 355 nm can be assigned to a MLCT (metal-to-ligand charge transfer) excited state [(Me(2)bpy)(CO)(3)Re(II)(PCA(-))](+), with lambda(max) = 460 nm and tau < 10 ns. The spectral properties of the related complexes [[Re(Me(2)bpy)(CO)(3)}(2)(PCA)](2+), [Re(CO)(3)(PCA)(2)Cl], and [Re(CO)(3)Cl](3)(PCA)(4) confirm the existence of this low-energy MLCT state. The dinuclear complex, of formula [(Me(2)bpy)(CO)(3)Re(I)(PCA)Ru(II)(NH(3))(5)](3+), presents an intense absorption in the visible spectrum that can be assigned to a MLCT d(pi)(Ru) --> pi(PCA); in CH(3)CN, the value of lambda (max) = 560 nm is intermediate between those determined for [Ru(NH(3))(5)(PCA)](2+) (lambda(max) = 536 nm) and [(NH(3))(5)Ru(PCA)Ru(NH(3))(5)](4+) (lambda(max) = 574 nm), indicating a significant decrease in the energy of the pi-orbital of PCA. The mixed-valent species, of formula [(Me(2)bpy)(CO)(3)Re(I)(PCA)Ru(III)(NH(3))(5)](4+), was obtained in CH(3)CN solution, by bromine oxidation or by controlled-potential electrolysis at 0.8 V in a OTTLE cell of the [Re(I),Ru(II)] precursor; the band at lambda(max) = 560 nm disappears completely, and a new band appears at lambda(max) = 483 nm, assignable to a MMCT band (metal-to-metal charge transfer) Re(I) --> Ru(III). By using the Marcus-Hush formalism, both the electronic coupling (H(AB)) and the reorganization energy (lambda) for the metal-to-metal intramolecular electron transfer have been calculated. Despite the considerable distance between both metal centers (approximately 15.0 Angstroms), there is a moderate coupling that, together with the comproportionation constant of the mixed-valent species [(NH(3))(5)Ru(PCA)Ru(NH(3))(5)](5+) (K(c) approximately 10(2), in CH(3)CN), puts into evidence an unusual enhancement of the metal-metal coupling in the bridged PCA complexes. This effect can be accounted for by the large extent of "metal-ligand interface", as shown by DFT calculations on free PCA. Moreover, lambda is lower than the driving force -DeltaG degrees for the recombination charge reaction [Re(II),Ru(II)] --> [Re(I),Ru(III)] that follows light excitation of the mixed-valent species. It is then predicted that this reverse reaction falls in the Marcus inverted region, making the heterodinuclear [Re(I),Ru(III)] complex a promising model for controlling the efficiency of charge-separation processes.
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Affiliation(s)
- Mauricio Cattaneo
- Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, (T4000INI) San Miguel de Tucumán, Argentina
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19
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Baumann F, Kaim W, Denninger G, Kümmerer HJ, Fiedler J. Widely Separated Reduction Processes of abpy-Coupled Areneosmium(II) Reaction Centers (abpy = 2,2‘-Azobispyridine): Stabilization of the Radical Intermediate and of the Os0OsII State. Organometallics 2005. [DOI: 10.1021/om049085t] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | | | | | - Jan Fiedler
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, CZ-18223 Prague, Czech Republic
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20
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Fundamentals and applications of near infrared spectroscopy in spectroelectrochemistry. J Solid State Electrochem 2004. [DOI: 10.1007/s10008-004-0524-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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21
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Fujino T, Hoshino Y, Igarashi S, Masuda Y, Yukawa Y. Preparation, structures and properties of oxalate-bridged binuclear iron(III) complex: [(acac)2Fe(μ-ox)Fe(acac)2] and [(acac)2Fe(μ-ox)Fe(acac)2]·CH2ClCH2Cl. Inorganica Chim Acta 2004. [DOI: 10.1016/s0020-1693(03)00435-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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22
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Cheng M, Euler WB. Synthesis and solution characterization of [Ru(bpy)2]2+ modified polyazines. Inorg Chem 2003; 42:5384-91. [PMID: 12924911 DOI: 10.1021/ic0343049] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of [Ru(bpy)(2)](2+) complexes linked by a controlled number of azine units (one to seven) were synthesized and studied in the solution phase. Polymers and dimer model compounds were examined by cyclic voltammetry and IR, NMR, and visible-NIR spectroscopies. The NMR spectra and the cyclic voltammograms indicated that the Ru(2+) sites influenced the main chain properties at least 15 A from the metal site. The first oxidation in each material was assigned to a ligand-centered process, but DFT calculations suggested that the Ru(2+) has an important influence. The first oxidized state of the polymers has a spectroscopic band that is consistent with an intervalence transfer (IT) transition, but this absorption is not seen in the dimer model compounds. Thus, the IT feature is assigned to a ligand-ligand transition that spans several repeat units in the polymer.
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Affiliation(s)
- Meng Cheng
- Department of Chemistry, 51 Lower College Road, University of Rhode Island, Kingston, Rhode Island 02881
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23
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Glöckle M, Katz NE, Ketterle M, Kaim W. Qualitatively and quantitatively different solvatochromism of the MLCT and MMCT absorption bands of centrosymmetric acceptor-bridged diiron(II,II) and diiron(III,II) cyanide complexes. Inorganica Chim Acta 2002. [DOI: 10.1016/s0020-1693(02)00846-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Yip JHK, Wu J, Wong KY, Yeung KW, Vittal JJ. Syntheses, Structures, and Electrochemistry of Polynuclear CuI, AgI, and PtII Complexes Bearing Ferrocenyl Group. Organometallics 2002. [DOI: 10.1021/om010998m] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- John H. K. Yip
- Department of Chemistry, The National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, and Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, People's Republic of China
| | - Jianguo Wu
- Department of Chemistry, The National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, and Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, People's Republic of China
| | - Kwok-Yin Wong
- Department of Chemistry, The National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, and Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, People's Republic of China
| | - Kin-Wai Yeung
- Department of Chemistry, The National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, and Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, People's Republic of China
| | - Jagadese J. Vittal
- Department of Chemistry, The National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260, and Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, People's Republic of China
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Sommovigo M, Ferretti A, Venturi M, Ceroni P, Giardi C, Denti G. Trinuclear pyrazine-bridged ruthenium complexes: syntheses, electrochemistry, NIR-Vis spectra, and their interpretation in terms of a 5-orbital-3-parameter model. Inorg Chem 2002; 41:1263-71. [PMID: 11874364 DOI: 10.1021/ic010869y] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A study of absorption spectra in the near-infrared (NIR) and visible (vis) regions of trinuclear Ru complexes containing pyrazine (pyz) as bridging ligand, trans-[(Ru(NH(3))(5)pyz)(2)Ru(NH(3))(4)](m+)(m = 6-9), is reported. The spectra were recorded on aqueous solutions containing the described species formed in situ by stoichiometric additions of a standard solution of Ce(SO(4))(2). They were interpreted in terms of a simple 5-orbital-3-parameter model which includes the effects of d-pi interaction and electronic correlation. The model is shown to account for the observed NIR-vis spectra of the complex ions. The 6+ parent species was synthesized by an improved literature method and fully characterized. The novel 8+ complex was also prepared and characterized. The 9+ ion was established to be slowly reduced by water, with dioxygen formation. Electrochemical (CV and DPV) studies were performed on the trinuclear 6+ complex, as well as on its constituent fragments [Ru(NH(3))(5)(pyz)](2+) and trans-[Ru(NH(3))(4)(pyz)(2)](2+).
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Affiliation(s)
- Milena Sommovigo
- Dipartimento di Chimica e Biotecnologie Agrarie, Università di Pisa, Via del Borghetto 80, I-56124 Pisa, Italy
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Gordon K, Burrell A, Simpson T, Page S, Kelso G, Polson M, Flood A. Probing the Nature of the Redox Products and Lowest Excited State of [(bpy)2Ru(μ-bptz)Ru(bpy)2]4+: A Resonance Raman Study. Eur J Inorg Chem 2002. [DOI: 10.1002/1099-0682(200203)2002:3<554::aid-ejic554>3.0.co;2-v] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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27
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Glöckle M, Kaim W, Klein A, Roduner E, Hübner G, Zalis S, van Slageren J, Renz F, Gütlich P. The stable diiron(2.5) complex ion [(NC)(5)Fe(mu-tz)Fe(CN)5](5-), tz = 1,2,4,5-tetrazine, and its neighboring oxidation states. Inorg Chem 2001; 40:2256-62. [PMID: 11327899 DOI: 10.1021/ic001229i] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The conceptually simple mixed-valent diiron compound (NEt(4))(5)[(NC)(5)Fe(mu-tz)Fe(CN)(5)] with the 1,2,4,5-tetrazine (tz) bridging ligand was obtained as a thermally and air-stable material that displays large and highly variable electrochemical comproportionation constants between about 10(8) (in water) and 10(19.0) (in acetonitrile). Strong metal-metal interaction is also evident from spectroscopic results obtained for the solid and for the dissolved species. The rather intense intervalence charge-transfer band occurs around 2400 nm; infrared and Mössbauer spectra reveal the high spectroscopic symmetry of the system according to an (Fe(2.5))(2) formulation. DFT calculations on the [(NC)(5)Fe(mu-tz)Fe(CN)(5)](6-) ion confirm the presence of very low-lying pi(tz) and high-lying d(Fe) orbitals.
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Affiliation(s)
- M Glöckle
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany
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Glöckle M, Hübler K, Kümmerer HJ, Denninger G, Kaim W. Dicopper(I) complexes with reduced states of 3,6-bis(2'-pyrimidyl)-1,2,4,5-tetrazine: crystal structures and spectroscopic properties of the free ligand, a radical species, and a complex of the 1,4-dihydro form. Inorg Chem 2001; 40:2263-9. [PMID: 11327900 DOI: 10.1021/ic001228q] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The complexes [(mu-bmtz(*-))[Cu(PPh(3))(2)](2)](BF(4)) (1) and [(mu-H(2)bmtz)[Cu(PPh(3))(2)](2)](BF(4))(2) (2) (bmtz = 3,6-bis(2'-pyrimidyl)-1,2,4,5-tetrazine and H(2)bmtz = 1,4-dihydro-3,6-bis(2'-pyrimidyl)-1,2,4,5-tetrazine) were obtained as stable materials that could be crystallized for structure determination. 1.2 CH(2)Cl(2): C(84)H(70)BCl(4)Cu(2)F(4)N(8)P(4); monoclinic, C2/c; a = 26.215(7) A, b = 22.122(6) A, c = 18.114(5) A, beta = 133.51(1) degrees; Z = 4. 2.CH(2)Cl(2): C(83)H(70)B(2)Cl(2)Cu(2)F(8)N(8)P(4); triclinic, P1; a = 10.948(2) A, b = 12.067(2) A, c = 30.287(6) A, alpha = 93.82(3) degrees, beta = 94.46(3) degrees, gamma = 101.60(3) degrees; Z = 2. Bmtz itself was also structurally characterized (C(10)H(6)N(8); monoclinic, P2(1)/c; a = 3.8234(8) A, b = 10.147(2) A, c = 13.195(3) A, beta = 94.92(3) degrees; Z = 2). Whereas the radical complex ion contains a planar tetrazine ring in the center, the 1,4-dihydrotetrazine heterocycle in the corresponding complex of H(2)bmtz is considerably folded. Both systems exhibit slight twists between the tetrazine and the pyrimidine rings. The intra-tetrazine distances are characteristically affected by the electron transfer, as is also evident from a comparison with the new structure of free bmtz; the bonding to copper(I) changes accordingly. Spectroscopy including X- and W-band EPR of the radical species confirms that the electron addition is mainly to the tetrazine ring.
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Affiliation(s)
- M Glöckle
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany
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Scheiring T, Fiedler J, Kaim W. Structure and Spectroelectrochemistry (UV/Vis, IR, EPR) of the Acceptor-Bridged Heterodinuclear Complex [(η5-C5Me5)ClRh(μ-bptz)Re(CO)3Cl](PF6), bptz = 3,6-Bis(2-pyridyl)-1,2,4,5-tetrazine. Organometallics 2001. [DOI: 10.1021/om000892b] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Thomas Scheiring
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany, and J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, CZ-18223 Prague, Czech Republic
| | - Jan Fiedler
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany, and J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, CZ-18223 Prague, Czech Republic
| | - Wolfgang Kaim
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany, and J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, CZ-18223 Prague, Czech Republic
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Shukla AD, Bajaj HC, Das A. β-Cyclodextrin-Assisted Intervalence Charge Transfer in Mixed-Valent [2]Rotaxane Complexes Having Metal Centers Linked by an Interrupted π-Electron System. Angew Chem Int Ed Engl 2001. [DOI: 10.1002/1521-3757(20010119)113:2<460::aid-ange460>3.0.co;2-r] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Shukla AD, Bajaj HC, Das A. β-Cyclodextrin-Assisted Intervalence Charge Transfer in Mixed-Valent [2]Rotaxane Complexes Having Metal Centers Linked by an Interrupted π-Electron System. Angew Chem Int Ed Engl 2001; 40:446-448. [DOI: 10.1002/1521-3773(20010119)40:2<446::aid-anie446>3.0.co;2-n] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2000] [Indexed: 11/06/2022]
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Kaim W, Reinhardt R, Greulich S, Sieger M, Klein A, Fiedler J. Coupling of Electron Transfer and Bond Dissociation Processes in Dinuclear Complexes with Rhodium and Iridium Reaction Centres Bridged by 2,2'-Bipyrimidine. ACTA ACUST UNITED AC 2001. [DOI: 10.1135/cccc20010291] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The complexes [{MCl(η5-C5Me5)}2(μ-bpym)](PF6)2, bpym = 2,2'-bipyrimidine and M = Rh or Ir, were obtained as isomerically pure species (M = Ir) or as mixtures of cis/trans isomers (M = Rh). Even though these compounds undergo partial dissociation into the mononuclear bpym- and solvento-complexes in DMF or acetonitrile, cyclic voltammetry and, in part, spectroscopy (NMR, EPR, UV-VIS) could be used to analyze their reduction with up to five electrons. In acetonitrile at room temperature, the dirhodium compound displays two sequential chloride-dissociative two-electron cathodic steps, leading to the very reactive [{Rh(η5-C5Me5)}2(μ-bpym)]. At -15 °C in DMF, the diiridium compound was found to be sufficiently inert towards dissociation; it is then reversibly reduced to an EPR-detectable radical cation [{IrCl(η5-C5Me5)}2(μ-bpym)]•+ before two separated chloride-dissociative steps occur.
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Kaim W, Klein A, Glöckle M. Exploration of mixed-valence chemistry: inventing new analogues of the Creutz-Taube ion. Acc Chem Res 2000; 33:755-63. [PMID: 11087312 DOI: 10.1021/ar960067k] [Citation(s) in RCA: 304] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Starting from the Creutz-Taube ion as the prototype of a molecule-bridged mixed-valent complex, a number of related systems are presented in which the metal, the co-ligands, the molecular bridge, the d electron configuration, the medium, the charge, the coordination mode, or the nuclearity have been modified. The new mixed-valent configurations, as obtained through various chemical approaches, display different stabilities and spectroscopic characteristics in relation to the Creutz-Taube ion; the analysis of these results serves to provide a better understanding of fundamental aspects of molecule-mediated metal-metal interaction.
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Affiliation(s)
- W Kaim
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany
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Glöckle M, Kaim W. Das außerordentlich stabile Dieisen(II,III)-Komplexion [(tz){Fe(CN)5}2]5− mit Komproportionierungskonstanten zwischen 108 (in H2O) und 1019 (in CH3CN). Angew Chem Int Ed Engl 1999. [DOI: 10.1002/(sici)1521-3757(19991018)111:20<3262::aid-ange3262>3.0.co;2-h] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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