• A Singh

      Articles written in Journal of Chemical Sciences

    • Trends in metallo-organic chemistry of scandium, yttrium, and the lanthanides

      A Singh

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      Several interesting aspects of the metallo-organic chemistry of Group 3 and the lanthanides have been highlighted, which include: (a) the chemistry of a few notable organolanthanide compounds; alkoxo and aryloxo derivatives derived from sterically demanding ligands, (b) new trends in the chemistry of lanthanide heterometallic alkoxides, (c) an account of zerovalent organometallics of yttrium and the lanthanides, and (d) aspects of agostic interactions in the lanthanide metallo-organic compounds.

    • Weak C-H$\cdots$F-C interactions in carboxylate anion binding: Synthesis, spectroscopic and X-ray structural studies of [Co(phen)2CO3]2 (C7H3O2FCl)Cl$\cdots$11H2O and [Co(phen)2CO3](C7H3NO4Cl)$\cdot$6H2O

      A Singh R P Sharma T Aree P Venugopalan

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      Two new complex salts containing 2,5-substituted benzoate ions, [Co(phen)2CO3]2 (C7H3O2FCl)Cl$\cdot$11H2O (1) and [Co(phen)2CO3](C7H3NO4Cl)$\cdot$6H2O (2) (where phen = 1,10-phenanthroline, C7H3O2FCl = 2-chloro-5-fluorobenzoate (cfbz) and C7H3NO4Cl = 2-chloro-5-nitrobenzoate(cnbz)) were synthesized by reacting carbonatobis(1,10-phenanthroline)cobalt(III) chloride with appropriate salts in aqueous medium. A detailed packing analysis has been undertaken to delineate the role of second sphere C-H$\cdots$F and C-H$\cdots$O interactions amid other heteroatom interactions. The complex salts have been characterized by elemental analyses, spectroscopic studies (IR, UV/Visible, multinuclear NMR), conductance and solubility product measurements. Single crystal X-ray structure determination revealed ionic structures of both the complex salts having discrete ions along with lattice water molecules. Crystal lattice is stabilized by a variety of hydrogen bonding interactions, i.e. O-H$\cdots$O, C-H$\cdots$O and C-H$\cdots$F involving second sphere coordination besides 𝜋-𝜋 interaction. Furthermore, packing analyses reveal that C-H…F interactions can manifest even in the presence of a large number of heteroatom interactions.

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