Department of Chemistry

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    Synthesis and Single-Crystal Structure of an Unusual Heptacoordinate Cadmium(II) Complex, [Cd(medien)(NO3)2] (medien = bis(2-aminoethyl)methylamine).
    (ACTA, 1998) Laskar, Inamur Rahaman
    Molecular geometry and coordination number play the key role in exploring the chemistry of a coordination compound.
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    Synthesis, Characterization and Thermal Studies of Bis(2-aminoethyl)methylamine(medien) Complexes of Cadmium(II). Single Crystal Structure of Cd(medien)I2.
    (ACTA, 1998) Laskar, Inamur Rahaman
    The synthesis and characterization of bis complexes of bis(2-aminoethyl) amine (dien) with transition and non transition metals are of interest as these complexes can potentially exist in three isomeric forms
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    A three dimensional network of Cadmium"
    (Wiley, 1999) Laskar, Inamur Rahaman
    In attempts to build molecular materials with interesting properties, such as catalysis clathration etc., much attention has been given to the synthesis of one-, two- and three-dimensional extended solids involving cadmium. Rigid bridged ligands are frequently employed to construct these materials (Abrahams et al., 1994[Abrahams, B. F., Hardie, M. J., Hoskins, B. F., Robson, R. & Sutherland, E. E. (1994). J. Chem. Soc. Chem. Commun. pp. 1049-1050.]; Soma et al., 1994[Soma, T., Yuge, H. & Iwamoto, T. (1994). Angew. Chem. Int. Ed. Engl. 33, 1665-1666.]; Fujita et al., 1994[Fujita, M., Kwon, Y. J., Miy­aza­wa, M. & Ogura, K. (1994). J. Chem. Soc. Chem. Commun. pp. 1977-1978.]; Yuge & Iwamoto, 1995[Yuge, H. & Iwamoto, T. (1995). Acta Cryst. C51, 374-377.]). The ambidentate thio­cyanate ion which is usually S-bonded to a soft and N-bonded to a hard metal centre can also act as a bridging bidentate ligand to satisfy the coordination number of the metal ion, although the thio­cyanate anion has not been widely used in the construction of inorganic polymeric networks. In order to synthesize uncharged three-dimensional polymers where channels remain unblocked by anions and free for solvent inclusion, we have chosen cadmium(II) thio­cyanate as an effective building block. Cadmium is well suited to this as its d10 configuration permits a wide variety of symmetries and coordination numbers. Recently, we reported the syntheses of the inorganic polymer [Cd3(dien)2(μ-NCS)6]n·nH2O (dien is diethyl­enetri­amine), (II[link]) (Mondal et al., 1999[Mondal, A., Mostafa, G., Ghosh, A., Laskar, I. R. & Ray Chaudhuri, N. (1999). J. Chem. Soc. Dalton Trans. pp. 9-10.]), which utilizes the full bridging potential of the anion. The structure of complex (II[link]) is a polymeric network which contains solvent-filled channels. Channel-containing solids have been and continue to be investigated intensively because of their potential applications, viz. as heterogeneous catalysts and molecular sieves. As part of a continuing investigation into control over the channels, we are currently studying the corresponding cadmium compounds. In this paper, we report the structure of the title CdII complex (I[link]), where medien [medien is N,N-bis(2-amino­ethyl)­methyl­amine] ligands replace the dien ligands of complex