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Sensitive Oxidation State Ambivalence in Unsymmetrical Three-Center (M/Q/M) Systems [(acac)2Ru(m-Q)Ru(acac)2]n, Q = 1,10-Phenanthroline-5,6-dione or 1,10-Phenanthroline-5,6-diimine (n = +, 0, -, 2-)

S. Ghumaan, B. Sarkar, S. Patra, J. van Slageren, J. Fiedler, W. Kaim, and G. Lahiri. Inorganic Chemistry, 44 (9): 3210--3214 (2005)
DOI: 10.1021/ic048309x

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Sandeep Vidyapu University of Stuttgart

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2,2'-Dipyridylketone (dpk) as Ancillary Acceptor and Reporter Ligand in Complexes [(dpk)(Cl)Ru(m-tppz)Ru(Cl)(dpk)]n+ where tppz = 2,3,5,6-Tetrakis(2-pyridyl)pyrazineS. Ghumaan, B. Sarkar, N. Chanda, M. Sieger, J. Fiedler, W. Kaim, and G. Lahiri. Inorganic Chemistry, 45 (19): 7955--7961 (2006)Valence-state analysis through spectroelectrochemistry in a series of quinonoid-bridged diruthenium complexes [(acac)2Ru(m-L)Ru(acac)2]n (n = +2, +1, 0, -1, -2)S. Ghumaan, B. Sarkar, S. Maji, V. Puranik, J. Fiedler, F. Urbanos, R. Jimenez-Aparicio, W. Kaim, and G. Lahiri. Chemistry - A European Journal, 14 (34): 10816--10828 (2008)A New Coordination Mode of the Photometric Reagent Glyoxalbis(2-hydroxyanil) (H2gbha): Bis-Bidentate Bridging by gbha2- in the Redox Series (μ-gbha)[Ru(acac)2]2n (n = -2, -1, 0, +1, +2), Including a Radical-Bridged Diruthenium(III) and a RuIII/RuIV IntermediateS. Kar, B. Sarkar, S. Ghumaan, D. Roy, F. Urbanos, J. Fiedler, R. Sunoj, R. Jimenez-Aparicio, W. Kaim, and G. Lahiri. Inorganic Chemistry, 44 (24): 8715--8722 (2005)Isovalent and Mixed-Valent Diruthenium Complexes [(acac)2RuII(m-bpytz)RuII(acac)2] and [(acac)2RuII(m-bpytz)RuIII(acac)2](ClO4) (acac = Acetylacetonate and bpytz = 3,6-Bis(3,5-dimethylpyrazolyl)-1,2,4,5-tetrazine): Synthesis, Spectroelectrochemical, and EPR InvestigationS. Patra, B. Sarkar, S. Ghumaan, J. Fiedler, W. Kaim, and G. Lahiri. Inorganic Chemistry, 43 (19): 6108--6113 (2004)(μ-L)[RuII(acac)2]2n, n = 2+, +, 0, -, 2-, with L = 3,3',4,4'-tetraimino-3,3',4,4'-tetrahydrobiphenyl. EPR-supported assignment of NIR absorptions for the paramagnetic intermediatesS. Patra, B. Sarkar, S. Ghumaan, J. Fiedler, S. Zalis, W. Kaim, and G. Lahiri. Dalton Transactions, (2004)Probing Mixed Valence in a New tppz-Bridged Diruthenium(III,II) Complex (μ-tppz)[Ru(bik)Cl]23+ (tppz = 2,3,5,6-Tetrakis(2-pyridyl)pyrazine, bik = 2,2'-Bis(1-methylimidazolyl)ketone): EPR Silence, Intervalence Absorption, and nCO Line BroadeningM. Koley, B. Sarkar, S. Ghumaan, E. Bulak, J. Fiedler, W. Kaim, and G. Lahiri. Inorganic Chemistry, 46 (9): 3736--3742 (2007)The triruthenium complex [(acac)2RuII3(L)] containing a conjugated diquinoxaline[2,3-f:2',3'-h]phenazine (L) bridge and acetylacetonate (acac) as ancillary ligands. Synthesis, spectroelectrochemical and EPR investigationS. Patra, B. Sarkar, S. Ghumaan, J. Fiedler, W. Kaim, and G. Lahiri. Dalton Transactions, (2004)2,5-Dioxido-1,4-benzoquinonediimine (H2L2-), a hydrogen-bonding noninnocent bridging ligand related to aminated topaquinone: Different oxidation state distributions in complexes [(bpy)2Ru2(m-H2L)]n (n = 0 , +, 2+, 3+, 4+) and [(acac)2Ru2(m-H2L)]m (m = 2-, -, 0, +, 2+)S. Kar, B. Sarkar, S. Ghumaan, D. Janardanan, J. van Slageren, J. Fiedler, V. Puranik, R. Sunoj, W. Kaim, and G. Lahiri. Chemistry - A European Journal, 11 (17): 4901--4911 (2005)Tetrazine derived mononuclear RuII(acac)2(L) (1), [RuII(bpy)2(L)](ClO4)2 (2) and [RuII(bpy)(L)2](ClO4)2 (3) (L = 3-amino-6-(3,5-dimethylpyrazol-1-yl)-1,2,4,5-tetrazine, acac = acetylacetonate, bpy = 2,2'-bipyridine): Syntheses, structures, spectra and redox propertiesA. Nayak, S. Patra, B. Sarkar, S. Ghumaan, V. Puranik, W. Kaim, and G. Lahiri. Polyhedron, 24 (2): 333--342 (2005)Ancillary ligand determination of the spin location in both oxidised and reduced forms of diruthenium complexes bridged by bis-bidentate 1,4-bis(2-phenolato)-1,4-diazabutadieneS. Kar, B. Sarkar, S. Ghumaan, M. Leboschka, J. Fiedler, W. Kaim, and G. Lahiri. Dalton Transactions, (2007)