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13 results on '"Goswami, Santu"'

8. [(Flu)-(CH2)2-(NHC)-CH2-(NHC)-(CH2)2-(Flu)]2−: an 'all-organic' hybrid and flexible ligand that enwraps a Ca2+ pseudo-tetrahedrally.

Author

Baguli, Sudip, Das, Shovan, Chakraborty, Mahua, Goswami, Santu, Datta, Ayan, and Mukherjee, Debabrata

Subjects
INFLUENZA
Abstract

A conformationally flexible ligand, [(Flu)-(CH2)2-(NHC)-CH2-(NHC)-(CH2)2-(Flu)]2− (L), that offers four sequential organic donor modules and enwraps a Ca2+ pseudo-tetrahedrally in a twisted 'S'-shape is devised. The [(L)Ca] synthesis is intriguingly stepwise involving the intermediate [(LH)Ca(HMDS)], whereas [(LH)Li2(HMDS)] shows the potential for bimetallic chemistry. The bonding is illustrated by energy decomposition analyses. [ABSTRACT FROM AUTHOR]

Published
2022
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10. Cyclopentadienyl Complexes of the Alkaline Earths in Light of the Periodic Trends.

Author

Baguli, Sudip, Mondal, Sumana, Mandal, Chhotan, Goswami, Santu, and Mukherjee, Debabrata

Subjects
RADIOACTIVITY, BARIUM, BERYLLIUM, METALS, RADIUM, ALKALINE earth metals, LIGANDS (Chemistry)
Abstract

The electron‐rich cyclopentadienyl and the analogous indenyl and fluorenyl ligands (collectively denoted here as Cp') have been impactful in stabilizing electron‐deficient metal centers including the highly electropositive alkaline earths. Being in the s‐block, the group 2 metals follow a major periodic variation in their atomic and ionic properties which is reflected in those Cp' compounds. This article presents an overview of this class of compounds for all the five metals from beryllium to barium (radium is excluded for its radioactivity), highlighting their systematic variation. [ABSTRACT FROM AUTHOR]

Published
2022
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11. An Imidazolium Salt That Uncharacteristically Avoids the Imminent Deprotonation of Its Acidic 2-HProton by KN(SiMe3)2

Author

Goswami, Santu, Sarkar, Subham, Mallick, Dibyendu, and Mukherjee, Debabrata

Abstract

KN(SiMe3)2, a non-nucleophilic strong base, rarely misses deprotonating an imidazolium-2-Hto give its N-heterocyclic carbene (NHC). We report a rare case of a -CH2-linked bifunctional imidazolium-phenol [HO-4,6-tBu2-C6H2-2-CH2{CH(NCH═CHNAr)}]Br [LH2Br; Ar = 2,6-iPr2–C6H3(Dipp)], whose attempted double deprotonation by KN(SiMe3)2majorly gives an unusual substitution product [(DippImd)K{O-4,6-tBu2-C6H2-2-CH2N(SiMe3)2}] (1; DippImd = CH{(NCH═CHN(Dipp)}). Apparently, the second KN(SiMe3)2, instead of deprotonating the imidazolium-2-H, substitutes the whole imidazolium moiety from the benzylic carbon. Control experiments indicate a SN1-type mechanism. But the intermediate LH, seemingly a zwitterionic imidazolium aryloxide, also shows a steady self-fragmentation by releasing free DippImd to suggest a complex formative route for 1. Interestingly, LiN(SiMe3)2in contrast favors the expected double deprotonation but further undergoes a 1,2-benzyl migration to give trimeric [Li(O-4,6-tBu2-C6H2-2-CH2{C(NCH═CHNAr)}]3[4]3. Two plausible routes for the substitution and deprotonation are proposed using DFT calculations. However, considering the complexities involved, a better clarity of the Li/K divergence would require a more accurate modeling of the reaction species and explicit solvent molecules.

Published
2024
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12. [(Flu)-(CH 2 ) 2 -(NHC)-CH 2 -(NHC)-(CH 2 ) 2 -(Flu)] 2- : an 'all-organic' hybrid and flexible ligand that enwraps a Ca 2+ pseudo-tetrahedrally.

Author

Baguli S, Das S, Chakraborty M, Goswami S, Datta A, and Mukherjee D

Abstract

A conformationally flexible ligand, [(Flu)-(CH 2 ) 2 -(NHC)-CH 2 -(NHC)-(CH 2 ) 2 -(Flu)] 2- (L), that offers four sequential organic donor modules and enwraps a Ca 2+ pseudo-tetrahedrally in a twisted 'S'-shape is devised. The [(L)Ca] synthesis is intriguingly stepwise involving the intermediate [(LH)Ca(HMDS)], whereas [(LH)Li 2 (HMDS)] shows the potential for bimetallic chemistry. The bonding is illustrated by energy decomposition analyses.

Published
2022
Full Text
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13. Cyclopentadienyl Complexes of the Alkaline Earths in Light of the Periodic Trends.

Author

Baguli S, Mondal S, Mandal C, Goswami S, and Mukherjee D

Abstract

The electron-rich cyclopentadienyl and the analogous indenyl and fluorenyl ligands (collectively denoted here as Cp') have been impactful in stabilizing electron-deficient metal centers including the highly electropositive alkaline earths. Being in the s-block, the group 2 metals follow a major periodic variation in their atomic and ionic properties which is reflected in those Cp' compounds. This article presents an overview of this class of compounds for all the five metals from beryllium to barium (radium is excluded for its radioactivity), highlighting their systematic variation., (© 2021 Wiley-VCH GmbH.)

Published
2022
Full Text
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