Goutam Kumar Lahiri
Articles written in Journal of Chemical Sciences
Volume 111 Issue 3 June 1999 pp 509-526 Modern Trends In Inorganic Chemistry
Bidyut Kumar Santra Goutam Kumar Lahiri
The reactions of potassium salt of dithiocarbonate, R′OCS2K,
Volume 114 Issue 4 August 2002 pp 443-449
Bridging function mediated intermetallic coupling in diruthenium-
Soma Chakraborty Biplab Mondal Biprajit Sarkar Goutam Kumar Lahiri
The interactions of potentially dinucleating bridging functionalities (
Volume 118 Issue 6 November 2006 pp 537-545
Tuning intermetallic electronic coupling in polyruthenium systems via molecular architecture
Sandeep Ghumaan Goutam Kumar Lahiri
A large number of polynuclear ruthenium complexes encompassing selective combinations of spacer (bridging ligand,
Volume 121 Issue 4 July 2009 pp 377-385
Prasenjit Maity Double Mukesh Sumit Bhaduri Goutam Kumar Lahiri
A series of water soluble Keggin type heteropolyoxotungstates have been tested as oxidation catalysts in aqueous-biphasic media with dilute H2O2 (30%) as the oxygen atom donor, without using any phase transfer agent. The Zn substituted polyoxoanion {(NH4)7Zn0.5[𝛼-ZnO4W11O30ZnO5(OH2)]$.n$H2O} has been found to be the most efficient catalyst, which oxidizes a wide range of organic functionalities with good turnovers and high selectivities. The functionalities that undergo oxidations are: organic sulfides, pyridines, anilines, benzyl alcohols and benzyl halides. The oxidations of sulfides to sulfoxides and/or sulfones have been studied in detail, and a simple kinetic model consisting of two consecutive reactions, is shown to give good fit with the experimental data. In the catalytic system described here product isolation is easy, and the aqueous catalyst solution can be re-used several times with little loss in its efficiency.
Volume 124 Issue 6 November 2012 pp 1181-1189
Electronic structures of ruthenium complexes encircling non-innocent ligand assembly
Amit Das Dipanwita Das Tanaya Kundu Goutam Kumar Lahiri
Electronic structural forms of selected mononuclear and dinuclear ruthenium complexes encompassing redox non-innocent terminal as well as bridging ligands have been addressed. The sensitive valence and spin situations of the complexes have been established in the native and accessible redox states via detailed analysis of their crystal structures, electrochemistry, UV/VIS/NIR spectroelectrochemistry, EPR signatures at the paramagnetic states and DFT calculations. Mononuclear complexes exhibit significant variations in valence and spin distribution processes based on the simple modification of the non-innocent ligand frameworks as well as electronic nature of the co-ligands, 𝜎-donating or 𝜋-accepting. Dinuclear complexes with modified pyrazine, 𝑝-quinone and azo-derived redox-active bridging ligands show complex features including redoxinduced electron-transfer (RIET), remote metal to metal spin-interaction in a three-spin metal-bridge-metal arrangement as well as electron-transfer driven chemical transformation (EC).
Volume 130 Issue 7 July 2018 Article ID 0088
Manganese-salen catalyzed oxidative benzylic chlorination
SHEULI SASMAL SUJOY RANA GOUTAM KUMAR LAHIRI DEBABRATA MAITI
Metalloporphyrins are well-known to serve as the model for mimicking reactivities exhibited by cytochrome P450 hydroxylase. Recent developments on selective C–H halogenation using Mn-porphyrins provided the way for understanding the reactivity as well as mechanism of different halogenase enzymes. In this report, we demonstrated a method for benzylic C–H chlorination using easily prepared Mn(salen) complex as the catalyst, which shows a complementary reactivity of Mn-porphyrins. Here, NaOCl has been used as a chlorinating source as well as the oxidant. Efforts towards understanding the mechanism suggested the formation of the high-valent Mn(V)=O species which is believed to be the key intermediate to conduct this transformation.
Volume 135, 2023
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