Items where Author is "Ghumaan, Sandeep"

Article

Ghumaan, Sandeep ; Sarkar, Biprajit ; Maji, Somnath ; Puranik, Vedavati G. ; Fiedler, Jan ; Urbanos, Francisco A. ; Jimenez-Aparicio, Reyes ; Kaim, Wolfgang ; Lahiri, Goutam Kumar (2008) Valence-state analysis through spectroelectrochemistry in a series of quinonoid-bridged diruthenium complexes [(acac)₂Ru(μ-L)Ru(acac)₂]ⁿ (n=+2, +1, 0, -1, -2) Chemistry - A European Journal, 14 (34). pp. 10816-10828. ISSN 0947-6539

Ghumaan, Sandeep ; Sarkar, Biprajit ; Patil, Mahendra P. ; Fiedler, Jan ; Sunoj, Raghavan B. ; Kaim, Wolfgang ; Lahiri, Goutam Kumar (2007) Multiple one-electron oxidation and reduction of trinuclear bis(2,4-pentanedionato)ruthenium complexes with substituted diquinoxalino[2,3-a:2',3'-c]phenazine ligands Polyhedron, 26 (13). pp. 3409-3418. ISSN 0277-5387

Koley, Moumita ; Sarkar, Biprajit ; Ghumaan, Sandeep ; Bulak, Ece ; Fiedler, Jan ; Kaim, Wolfgang ; Lahiri, Goutam Kumar (2007) Probing mixed valence in a new tppz-bridged diruthenium(III,II) Complex {(μ -tppz)[Ru(bik)Cl]₂}³⁺ (tppz = 2,3,5,6-tetrakis(2-pyridyl)pyrazine, bik = 2,2'-bis(1-methylimidazolyl)ketone): EPR silence, intervalence absorption, and ν_CO line broadening Inorganic Chemistry, 46 (9). pp. 3736-3742. ISSN 0020-1669

Kar, Sanjib ; Sarkar, Biprajit ; Ghumaan, Sandeep ; Leboschka, Markus ; Fiedler, Jan ; Kaim, Wolfgang ; Lahiri, Goutam Kumar (2007) 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-diazabutadiene Dalton Transactions (19). pp. 1934-1938. ISSN 0300-9246

Ghumaan, Sandeep ; Lahiri, Goutam Kumar (2006) Tuning intermetallic electronic coupling in polyruthenium systems via molecular architecture Journal of Chemical Sciences, 118 (6). pp. 537-545. ISSN 0253-4134

Ghumaan, Sandeep ; Mukherjee, Sriparna ; Kar, Sanjib ; Roy, Dipankar ; Mobin, Shaikh M. ; Sunoj, Raghavan B. ; Lahiri, Goutam Kumar (2006) An experimental and density functional theory approach towards the establishment of preferential metal- or ligand-based electron-transfer processes in large quinonoid-bridged diruthenium complexes [{(aap)₂Ru}₂(μ-BL^2-)]ⁿ⁺ (aap = 2-arylazopyridine) European Journal of Inorganic Chemistry, 2006 (21). pp. 4426-4441. ISSN 1434-1948

Ghumaan, Sandeep ; Mukherjee, Sriparna ; Kar, Sanjib ; Roy, Dipankar ; Mobin, Shaikh M. ; Sunoj, Raghavan B. ; Lahiri, Goutam Kumar (2006) An experimental and density functional theory approach towards the establishment of preferential metal- or ligand-based electron-transfer processes in large quinonoid-bridged diruthenium complexes [{(aap)₂ru}₂(μ-bl^2–)]ⁿ⁺ (aap = 2-arylazopyridine) European Journal of Inorganic Chemistry, 2006 (21). pp. 4426-4441. ISSN 1434-1948

Ghumaan, Sandeep ; Sarkar, Biprajit ; Chanda, Nripen ; Sieger, Monika ; Fiedler, Jan ; Kaim, Wolfgang ; Lahiri, Goutam Kumar (2006) 2,2'-dipyridylketone (dpk) as ancillary acceptor and reporter ligand in complexes [(dpk)(Cl)Ru(μ -tppz)Ru(Cl)(dpk)]ⁿ⁺ where tppz = 2,3,5,6-Tetrakis(2-pyridyl)pyrazine Inorganic Chemistry, 45 (19). pp. 7955-7961. ISSN 0020-1669

Ghumaan, Sandeep ; Kar, Sanjib ; Mobin, Shaikh M. ; Harish, B. ; Puranik, Vedavati G. ; Lahiri, Goutam Kumar (2006) 2,4,6-Tris(2-pyridyl)-1,3,5-triazine (tptz)-derived [Ru^II(tptz)(acac)(CH₃CN)]⁺ and Mixed-Valent [(acac)₂Ru^III{(μ -tptz-H⁺)^-}Ru^II(acac)(CH₃CN)] Inorganic Chemistry, 45 (6). pp. 2413-2423. ISSN 0020-1669

Kar, Sanjib ; Sarkar, Biprajit ; Ghumaan, Sandeep ; Roy, Dipankar ; Urbanos, Francisco A. ; Fiedler, Jan ; Sunoj, Raghavan B. ; Jimenez-Aparicio, Reyes ; Kaim, Wolfgang ; Lahiri, Goutam Kumar (2005) A new coordination mode of the photometric reagent glyoxalbis(2-hydroxyanil) (H₂gbha): bis-bidentate bridging by gbha^2- in the redox series {(μ-gbha)[Ru(acac)₂]₂}ⁿ (n = -2, -1, 0, +1, +2), Including a Radical-Bridged Diruthenium(III) and a Ru^III/Ru^IV Intermediate Inorganic Chemistry, 44 (24). pp. 8715-8722. ISSN 0020-1669

Kar, Sanjib ; Sarkar, Biprajit ; Ghumaan, Sandeep ; Janardanan, Deepa ; Slageren, Joris van ; Fiedler, Jan ; Puranik, Vedavati G. ; Sunoj, Raghavan B. ; Kaim, Wolfgang ; Lahiri, Goutam Kumar (2005) 2,5-dioxido-1,4-benzoquinonediimine (H₂L²-), a hydrogen-bonding noninnocent bridging ligand related to aminated topaquinone: different oxidation state distributions in complexes [{(bpy)₂Ru}₂(μ-H₂L)]ⁿ (n=0,+,2+,3+,4+) and [{(acac)₂Ru}₂(μ-H₂L)]^m (m=2-,-,0,+,2+) Chemistry - A European Journal, 11 (17). pp. 4901-4911. ISSN 0947-6539

Kar, Sanjib ; Sarkar, Biprajit ; Ghumaan, Sandeep ; Janardanan, Deepa ; van Slageren, Joris ; Fiedler, Jan ; Puranik, Vedavati G. ; Sunoj, Raghavan B. ; Kaim, Wolfgang ; Lahiri, Goutam Kumar (2005) 2,5-dioxido-1,4-benzoquinonediimine (H₂L²⁻), a hydrogen-bonding noninnocent bridging ligand related to aminated topaquinone: different oxidation state distributions in complexes [{(bpy)₂Ru}₂(μ-H₂L)]ⁿ (n = 0,+,2+,3+,4+) and [{(acac)₂Ru}₂(μ-H₂L)]^m (m = 2−,−,0,+,2+) Chemistry - A European Journal, 11 (17). pp. 4901-4911. ISSN 0947-6539

Ghumaan, Sandeep ; Sarkar, Biprajit ; Patra, Srikanta ; Slageren, Joris van ; Fiedler, Jan ; Kaim, Wolfgang ; Lahiri, Goutam Kumar (2005) Sensitive oxidation state ambivalence in unsymmetrical three-center (M/Q/M) Systems [(acac)₂Ru(μ-Q)Ru(acac)₂]ⁿ, Q = 1,10-phenanthroline-5,6-dione or 1,10-phenanthroline-5,6-diimine (n = +, 0, -, 2-) Inorganic Chemistry, 44 (9). pp. 3210-3214. ISSN 0020-1669

Patra, Srikanta ; Sarkar, Biprajit ; Ghumaan, Sandeep ; Patil, Mahendra P. ; Mobin, Shaikh M. ; Sunoj, Raghavan B. ; Kaim, Wolfgang ; Lahiri, Goutam Kumar (2005) Isomeric ruthenium terpyridine complexes [Ru(trpy)(L)Cl]ⁿ⁺ containing the unsymmetrically bidentate acceptor L = 3-amino-6-(3,5-dimethylpyrazol-1-yl)-1,2,4,5-tetrazine. Synthesis, structures, electrochemistry, spectroscopy and DFT calculations Dalton Transactions (7). pp. 1188-1194. ISSN 0300-9246

Nayak, Animesh ; Patra, Srikanta ; Sarkar, Biprajit ; Ghumaan, Sandeep ; Puranik, Vedavati G. ; Kaim, Wolfgang ; Lahiri, Goutam Kumar (2005) Tetrazine derived mononuclear Ru^II(acac)₂(L) (1), [Ru^II(bpy)₂(L)](ClO₄)₂ (2) and [Ru^II(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 properties Polyhedron, 24 (2). pp. 333-342. ISSN 0277-5387

Patra, Srikanta ; Sarkar, Biprajit ; Ghumaan, Sandeep ; Fiedler, Jan ; Kaim, Wolfgang ; Lahiri, Goutam Kumar (2004) Isovalent and mixed-valent diruthenium complexes [(acac)₂Ru^II (μ-bpytz)Ru^II(acac)₂] and [(acac)₂Ru^II(μ-bpytz)Ru^III(acac)₂](ClO₄) (acac = acetylacetonate and bpytz = 3,6-bis(3,5-dimethylpyrazolyl)-1,2,4,5-tetrazine): synthesis, spectroelectrochemical, and EPR investigation Inorganic Chemistry, 43 (19). pp. 6108-6113. ISSN 0020-1669

Patra, Srikanta ; Sarkar, Biprajit ; Ghumaan, Sandeep ; Fiedler, Jan ; Záliš, Stanislav ; Kaim, Wolfgang ; Lahiri, Goutam Kumar (2004) {(µ-L)[Ru^II(acac)₂]₂}ⁿ, 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 intermediates Dalton Transactions (5). pp. 750-753. ISSN 0300-9246

Ghumaan, Sandeep ; Sarkar, Biprajit ; Patra, Srikanta ; Parimal, Kumar ; van Slageren, Joris ; Fiedler, Jan ; Kaim, Wolfgang ; Lahiri, Goutam Kumar (2004) 3,6-Bis(2-pyridyl)pyridazine (L) and its deprotonated form (L - H⁺)^- as ligands for {(acac)₂Ruⁿ⁺} or {(bpy)₂^Rum+}: investigation of mixed valency in [{(acac)₂Ru}₂(μ -L - H⁺)]⁰ and [{(bpy)₂Ru}₂(μ-L - H⁺)]⁴⁺ by spectroelectrochemistry and EPR Dalton Transactions (004). pp. 706-712. ISSN 0300-9246

Patra, Srikanta ; Sarkar, Biprajit ; Ghumaan, Sandeep ; Fiedler, Jan ; Kaim, Wolfgang ; Lahiri, Goutam Kumar (2004) The triruthenium complex [{(acac)₂Ru^II}₃(L)] containing a conjugated diquinoxaline[2,3-a:2',3'-c]phenazine (L) bridge and acetylacetonate (acac) as ancillary ligands. Synthesis, spectroelectrochemical and EPR investigation Dalton Transactions (5). pp. 754-758. ISSN 0300-9246