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Introduction to Organometallics
Published in Samir H. Chikkali, Metal-Catalyzed Polymerization, 2017
Samir H. Chikkali, Sandeep Netalkar
Hapticity in coordination chemistry is a concept denoting the number of adjacent or proximate atoms of a single ligand bonded to the single central metal atom. The Greek letter η spelled as eta is used to represent hapticity of a ligand with a superscript indicating the number of adjacent atoms. Hapticity should not be confused with denticity. If a multiple number of atoms are bound to the central metal that are not adjacent it is multidentate ligand.
Spectroscopic, structural, electrochemical, and cytotoxicity studies on dithiocarbamato-chelated ruthenium organometallics incorporating imine-phenol function
Published in Journal of Coordination Chemistry, 2019
Mrinal Kanti Ghosh, Suman Mandal, Sudip Mohapatra, Annesha Chatterjee, Arindam Bhattacharyya, Swarup Chattopadhyay
In this work, we have reported the synthesis and characterization of ruthenium complexes of type [Ru(η1-RL)(PPh3)2(CO)(R′DTC)] (2(R)(R′DTC)) from [Ru(η2-RL)(PPh3)2(CO)Cl] (1) via chloride displacement. As revealed by structural and spectroscopic data, rational changes in tautomeric form, hapticity, and conformation of RL ligand occur in going from 1 → 2. Steric repulsion between the dithiocarbamato sulfur and the phenolic oxygen atoms leads to the rotameric anti → syn isomerization of the phenolic function with respect to the carbonyl ligand. In vitro cytotoxicity experiment shows that 2(Cl)(PyrDTC) has growth-inhibitory effect on MDA-MB-231 cells, inducing sub G0/G1 cell-cycle arrest and cell death through apoptosis. To have better insight into the geometry, electronic structures and absorption spectra of the complexes, DFT and TD-DFT calculations were performed. The computed vertical excitation energies are in good agreement with the experimental ones.