Biswajit Laha

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Papers by Biswajit Laha

Room temperature synthesis of new isoreticular 2D metal–organic frameworks of Co(II) and Ni(II) comprised of dual semiflexible neutral and anionic linkers, and their conversion to metal oxide nanomaterials

Inorganica Chimica Acta

Novel Pharmaceutical Cocrystals of Gefitinib: A Credible Upswing in Strategic Research to Ameliorate Its Biopharmaceutical Challenges

CCDC 2040524: Experimental Crystal Structure Determination

CCDC 2040527: Experimental Crystal Structure Determination

CCDC 2040525: Experimental Crystal Structure Determination

CCDC 2040528: Experimental Crystal Structure Determination

CCDC 2010036: Experimental Crystal Structure Determination

CCDC 2010037: Experimental Crystal Structure Determination

CCDC 2010038: Experimental Crystal Structure Determination

CCDC 1937967: Experimental Crystal Structure Determination

CCDC 1937966: Experimental Crystal Structure Determination

Effecting structural diversity in a series of Co(ii)–organic frameworks by the interplay between rigidity of a dicarboxylate and flexibility of bis(tridentate) spanning ligands

Dalton Transactions, 2020

Utilizing the angular and rigid thiophene dicarboxylate, diversity in metal organic frameworks of... more

Ruthenium Catalyzed C−H Acylmethylation of N ‐Arylphthalazine‐1,4‐diones with α‐Carbonyl Sulfoxonium Ylides: Highway to Diversely Functionalized Phthalazino‐fused Cinnolines

Chemistry – An Asian Journal, 2019

A direct ortho-Csp 2-H acylmethylation of 2-aryl-2,3dihydrophthalazine-1,4-diones with α-carbonyl... more A direct ortho-Csp 2-H acylmethylation of 2-aryl-2,3dihydrophthalazine-1,4-diones with α-carbonyl sulfoxonium ylides is achieved through Ru(II)-catalyzed C-H bond activation process. The protocol featured high functional group tolerance on the two substrates, including aryl, heteroaryl, and alkyl substituted αcarbonyl sulfoxonium ylides. Thereafter, 2-(ortho-acylmethylaryl)-2,3-dihydrophthalazine-1,4-diones outshined as dynamic input stocks for the expeditious synthesis of 6-arylphthalazino[2,3a]cinnoline-8,13-diones and 5-acyl-5,6-dihydrophthalazino[2,3a]cinnoline-8,13-diones under Lawesson's reagent and BF3. OEt2 mediated conditions, respectively. Of these, the BF3. OEt2mediated cyclization proceeded in DMSO as a solvent and a methylene source via dual CC and C-N bond formations. Scheme 1. Previous and present works on o-acylmethylation and annulation using sulfoxonium ylides In comparison, ruthenium-catalyzed C-C/C-N bond forming transformations using α-carbonyl sulfoxonium ylides are explored [a]

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Influence of Thermal Perturbation of the Oligomeric Size of -Crystallin on its Chaperone Function – A Biophysical Study

and that neither this thesis nor any part of its has been submitted for any degree/diploma of any... more

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Deciphering supramolecular isomerization in coordination polymers: connected molecular squares vs. fused hexagons

Dalton Transactions

Supramolecular isomerization in coordination polymers is demonstrated by using bis(tridentate) po... more

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CCDC 2040526: Experimental Crystal Structure Determination

CCDC 2010039: Experimental Crystal Structure Determination

Ruthenium complexes of two different non-innocent ligands. Investigation of electronic structural aspects by experimental and DFT analysis

Indian Journal of …, 2011

Synthesis and characterisation of the ruthenium complexes, [Ru II (Q)(tppz)(Cl)]ClO 4 (1) and [{R... more Synthesis and characterisation of the ruthenium complexes, [Ru II (Q)(tppz)(Cl)]ClO 4 (1) and [{Ru II (Q)Cl} 2 -(µ-tppz)](ClO 4 ) 2 (2), incorporating redox noninnocent ligands, (Q = o-benzoquinonediimine, tppz = 2,3,5,6-tetrakis-(2-pyridyl)pyrazine) are reported. The crystal structure of (1) and DFT optimized structure of (2) in comparison with the reported structures of analogous molecules establish that their valence configurations comprise the fully oxidized Q o and tppz o along with the Ru(II) center as well as non-planarity of the coordinated tppz. The reversible Ru II /Ru III oxidation of (1) and two successive Ru II /Ru III couples for (2) appear at 0.95 V and 0.96, 1.11 V vs SCE in CH 3 CN, respectively. The separation in potential of 0.15 V between the two successive oxidation processes in (2) leads to the comproportionation constant, K c value of 3.5×10 2 , which implies a rather weakly coupled (electrochemical) valence localized class II mixed valent Ru II Ru III state in (2) + . However, the DFT calculated Mulliken spin densities of (2) + (Ru1, Ru2, Q, tppz and Cl of 0.333, 0.412, 0.070, −0.006 and 0.221, respectively) suggest an almost valence averaged situation. The compositions of molecular orbitals of (1) and (2) suggest appreciable (dπ)Ru II →π * (tppz)/π * (Q) back-bonding. Both the complexes exhibit multiple close-by reductions within the potential range of 0 to −2.0 V vs SCE in CH 3 CN which are assigned to be the ligand (Q/tppz) based reductions. The molecular orbital compositions predict Q based first reduction followed by tppz-based successive reductions in (1), whereas in (2) first reduction primarily takes place at the bridging tppz center followed by the reduction of Q. (1) and (2) exhibit multiple metal-to-ligand charge transfer transitions in the visible region due to the presence of two and three acceptor ligands, respectively. The key transitions in the visible region are assigned based on the TD-DFT calculations on optimized structures of (1) and .

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Influence of Thermal Perturbation of the Oligomeric Size of-Crystallin on its Chaperone Function–A Biophysical Study

This is to certify that the thesis/ dissertation entitled "Influence of Thermal Perturbation of t... more This is to certify that the thesis/ dissertation entitled "Influence of Thermal Perturbation of the Oligomeric Size of ?-Crystallin on its Chaperone Function -A Biophysical Study" submitted by Sri / Smt. Biswajit Laha, M.Sc. 2 nd year student (Roll No. 408CY113) of National institute of technology Rourkela, Orissa, India for the award of

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