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      https://www.ias.ac.in/article/fulltext/jcsc/126/03/0763-0769

    • Keywords

       

      Dinuclear mercury(II) iodide; tripodal amine; Schiff base bridge; X-ray structure; luminescence.

    • Abstract

       

      Two dinuclear mercury(II) iodide complexes of the types [(L1)Hg(𝜇-I)HgI3] (1) and [Hg2(L2) (I)4]·H2O (2) [L1 = tris(2-aminoethyl)amine and L2 = N,N'-(bis-(pyridin-2-yl)benzylidene)diethylenetriamine] have been synthesized and characterized usingmicroanalytical, spectroscopic, thermal and other physicochemical results. Structures of both the compounds are solved by X-ray diffraction measurements. Structural analyses show that one mercury (II) centre in 1 adopts a distorted tetrahedral geometry with an HgI4 chromophore surrounded by four iodides, while the other has a distorted trigonal bipyramidal environment with an HgN4I chromophore bound by four N atoms of L1 and one bridging iodide. Pentadentate Schiff base (L2) in 2 shows unusual binucleating bis(bidentate) behaviour to bind two different mercury(II) centres—Hg1 with an HgN3I2 chromophore in a distorted square pyramidal geometry and Hg2 with an HgN2I2 chromophore in a tetrahedral environment. Weak intermolecularN-H…I hydrogen bonds in 1 and cooperative C-H$\ldots$𝜋 and $\pi\ldots \pi$ interactions in 2 promote dimensionalities. The Schiff base complex, 2, shows intraligand ($\pi-\pi^\ast$) fluorescence in DMF solution at room temperature, whereas compound 1 containing tripodal amine is fluorescent-inactive.

    • Author Affiliations

       

      Subhasis Roy1 Soumi Chattopadhyay1 Somnath Choubey1 Kishalay Bhar1 Partha Mitra2 Barindra Kumar Ghosh1

      1. Department of Chemistry, The University of Burdwan, Burdwan 713 104, India
      2. Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700 032, India
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