2024 : 11 : 23
Ghodrat Mahmoudi

Ghodrat Mahmoudi

Academic rank: Associate Professor
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Education: PhD.
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Research

Title
Solvent-Induced Formation of Novel Ni(II) Complexes Derived from Bis-Thiosemicarbazone Ligand: An Insight from Experimental and Theoretical Investigations
Type
JournalPaper
Keywords
Ni(II) complexes; intermolecular C–HNi interactions; -metalloaromaticity
Year
2021
Journal INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
DOI
Researchers Ghodrat Mahmoudi ، Maria G. Babashkina ، Waldemar Maniukiewicz, ، Farhad Akbari Afkhami ، Bharath Babu Nunna ، Fedor I. Zubkov ، Aleksandra L. Ptaszek ، Dariusz W. Szczepanik, ، Mariusz P. Mitoraj, ، Damir A Safin

Abstract

In this work, we report solvent-induced complexation properties of a newN2S2 tetradentate bis-thiosemicarbazone ligand (H2LI), prepared by the condensation of 4-phenylthiosemicarbazide with bis-aldehyde, namely 2,2’-(ethane-1,2-diylbis(oxy)dibenzaldehyde, towards nickel(II). Using ethanol as a reaction medium allowed the isolation of a discrete mononuclear homoleptic complex [NiLI] (1), for which its crystal structure contains three independent molecules, namely 1-I, 1-II, and 1- III, in the asymmetric unit. The doubly deprotonated ligand LI in the structure of 1 is coordinated in a cis-manner through the azomethine nitrogen atoms and the thiocarbonyl sulfur atoms. The coordination geometry around metal centers in all the three crystallographically independent molecules of 1 is best described as the seesaw structure. Interestingly, using methanol as a reaction medium in the same synthesis allowed for the isolation of a discrete mononuclear homoleptic complex [Ni(LII)2] (2), where LII is a monodeprotonated ligand 2-(2-(2-(2-(dimethoxymethyl)phenoxy)ethoxy)benzylidene)- N-phenylhydrazine-1-carbothioamide (HLII). The ligand LII was formed in situ from the reaction of LI with methanol upon coordination to the metal center under synthetic conditions. In the structure of 2, two ligands LII are coordinated in a trans-manner through the azomethine nitrogen atom and the thiocarbonyl sulfur atom, also yielding a seesaw coordination geometry around the metal center. The charge and energy decomposition scheme ETS-NOCV allows for the conclusion that both structures are stabilized by a bunch of London dispersion-driven intermolecular interactions, including predominantly N–HS and N–HO hydrogen bonds in 1 and 2, respectively; they are further augmented by less typical C–HX (where X = S, N, O, ), CHHC,  stacking and the most striking, attractive long-range intermolecular C–HNi preagostic interactions. The latter are found to be determined by both stabilizing Co