Výsledky vyhledávání - "Sandeep Ghumaan"

Tuning intermetallic electronic coupling in polyruthenium systems via molecular architecture

Autor: Goutam Kumar Lahiri, Sandeep Ghumaan

Publikováno v: Journal of Chemical Sciences. 118:537-545

A large number of polynuclear ruthenium complexes encompassing selective combinations of spacer (bridging ligand,BL) and ancillary (AL) functionalities have been designed. The extent of intermetallic electronic communication in mixed-valent states an

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https://doi.org/10.1007/bf02703951

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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) 2 Ru} 2 (μ‐BL 2 – )] n + (aap = 2‐Arylazopyridine)

Autor: Goutam Kumar Lahiri, Shaikh M. Mobin, Raghavan B. Sunoj, Dipankar Roy, Sriparna Mukherjee, Sandeep Ghumaan, Sanjib Kar

Publikováno v: European Journal of Inorganic Chemistry. 2006:4426-4441

A group of ten quinonoid-bridged diruthenium(II) complexes [(aap) 2 Ru II (μ-BL 1 2– )Ru II (aap) 2 ](ClO 4 ) 2 , [1a–1c](ClO 4 ) 2 and [(pap) 2 Ru II (μ-BL n 2– )Ru II (pap) 2 ](ClO 4 ) 2 [2–8](ClO 4 ) 2 [aap = 2-arylazopyridine, NC 5 H 4

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https://doi.org/10.1002/ejic.200600638

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3,6-Bis(2′-pyridyl)pyridazine (L) and its deprotonated form (L − H+)−as ligands for {(acac)2Run+} or {(bpy)2Rum+}: investigation of mixed valency in [{(acac)2Ru}2(μ-L − H+)]0and [{(bpy)2Ru}2(μ-L − H+)]4+by spectroelectrochemistry and EPR

Autor: Sandeep Ghumaan, Srikanta Patra, Joris van Slageren, Biprajit Sarkar, Goutam Kumar Lahiri, Jan Fiedler, Wolfgang Kaim, Kumar Parimal

Publikováno v: Dalton Trans.. :706-712

Crystallographically characterised 3,6-bis(2′-pyridyl)pyridazine (L) forms complexes with {(acac)2Ru} or {(bpy)2Ru2+} via one pyridyl-N/pyridazyl-N chelate site in mononuclear RuII complexes (acac)2Ru(L), 1, and [(bpy)2Ru(L)](ClO4)2, [3](ClO4)2. Co

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https://doi.org/10.1039/b417530a

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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 properties

Autor: Goutam Kumar Lahiri, Sandeep Ghumaan, Biprajit Sarkar, Srikanta Patra, Vedavati G. Puranik, Animesh Nayak, Wolfgang Kaim

Publikováno v: Polyhedron. 24:333-342

Mononuclear ruthenium complexes of tetrazine derived L, 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 and bpy = 2,2′-bipyridine) wer

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https://doi.org/10.1016/j.poly.2004.11.019

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Isovalent and Mixed-Valent Diruthenium Complexes [(acac)2RuII (μ-bpytz)RuII(acac)2] and [(acac)2RuII(μ-bpytz)RuIII(acac)2](ClO4) (acac = Acetylacetonate and bpytz = 3,6-Bis(3,5-dimethylpyrazolyl)-1,2,4,5-tetrazine): Synthesis, Spectroelectrochemical, and EPR Investigation

Autor: Srikanta Patra, Wolfgang Kaim, Sandeep Ghumaan, Biprajit Sarkar, Goutam Kumar Lahiri, Jan Fiedler

Publikováno v: Inorganic Chemistry. 43:6108-6113

The title compounds involving the structurally characterized bridging ligand bpytz were characterized, showing very strong electrochemical stabilization of the mixed-valent RuIIRuIII state (Kc = 1013.9) but no detectable (e < 20 M-1 cm-1) intervalenc

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https://doi.org/10.1021/ic049346r

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{(μ-L)[RuII(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

Autor: Wolfgang Kaim, Sandeep Ghumaan, Biprajit Sarkar, Srikanta Patra, Stanislav Záliš, Jan Fiedler, Goutam Kumar Lahiri

Publikováno v: Dalton Trans.. :750-753

A complete EPR and UV-Vis-NIR spectroelectrochemical characterisation has been carried out for the series 1(2+/+/0/-/2-) where 1 is the new complex {(mu-L)[Ru-II(acac)(2)](2)}, L = 3,3',4,4'-tetraimino-3,3',4,4'-tetrahydrobiphenyl. The paramagnetic i

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https://doi.org/10.1039/b315927m

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Valence-state analysis through spectroelectrochemistry in a series of quinonoid-bridged diruthenium complexes [(acac)(2)Ru(mu-L)Ru(acac)(2)](n) (n=+2, +1, 0, -1, -2)

Autor: Reyes Jiménez-Aparicio, Goutam Kumar Lahiri, Somnath Maji, Sandeep Ghumaan, Francisco A. Urbanos, Vedavati G. Puranik, Biprajit Sarkar, Wolfgang Kaim, Jan Fiedler

Publikováno v: Chemistry (Weinheim an der Bergstrasse, Germany). 14(34)

The quinonoid ligand-bridged diruthenium compounds [(acac) 2 Ru-(μ-L 2- )Ru(acac) 2 ] (acac - = acetylacetonato = 2,4-pentanedionato; L 2- = 2,5-di-oxido-1,4-benzoquinone, 1; 3,6-di-chloro-2,5-dioxido-1,4-benzoquinone, 2; 5,8-dioxido-1,4-naphthoquin

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https://pubmed.ncbi.nlm.nih.gov/18924186

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Probing mixed valence in a new tppz-bridged diruthenium(III,II) complex {(mu-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 nu(CO) line broadening

Autor: Goutam Kumar Lahiri, Biprajit Sarkar, Wolfgang Kaim, Sandeep Ghumaan, Jan Fiedler, Ece Bulak, Moumita Koley

Publikováno v: Inorganic chemistry. 46(9)

The complex dication of the diruthenium(II) compound {(mu-tppz)[Ru(bik)Cl]2}(ClO4)2 can be oxidized and reduced in two one-electron steps each. In CH3CN/0.1 M Bu4NPF6, the odd-electron intermediates{(mu-tppz)[Ru(bik)Cl]2}n+, n=1 and 3, have compropor

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https://pubmed.ncbi.nlm.nih.gov/17388585

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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

Autor: Jan Fiedler, Biprajit Sarkar, Markus Leboschka, Sanjib Kar, Wolfgang Kaim, Sandeep Ghumaan, Goutam Kumar Lahiri

Publikováno v: IndraStra Global.

The rare bridging mode of 1,4-bis(2-phenolato)-1,4-diazabutadiene = glyoxalbis(2-hydroxyanil) (L2-) is adopted in {(mu-L2-)[Ru-II(bpy)(2)](2)}(2+) (1(2+)), obtained as bis-perchlorate. Four well accessible redox forms of 1(n) (n = 4+, 3+, 2+, +) have

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http://dspace.library.iitb.ac.in/xmlui/handle/10054/11678

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