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Issue 6, 2002
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Flexibility in co-ordinative behaviour of N-(3-hydroxypropyl)ethane-1,2-diamine toward cadmium(II) halides: syntheses, crystal structures and solid state thermal studies

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Abstract

One new two-dimensional and two one-dimensional organic/inorganic composite coordination polymers have been synthesised by the reaction of cadmium(II) halides with N-(3-hydroxypropyl)ethane-1,2-diamine (L) and structurally characterised. [Cd(L)Cl2]n (1) is a two-dimensional sheet which is built from intersecting zigzag chains and forms a honeycomb like (6,3) net where each octahedral cadmium is linked with two bridging chloride atoms, one pendant chloride atom, two chelated nitrogen atoms of L and an oxygen atom from a neighbouring ligand; each cadmium(II) acts as a branching centre. [Cd(L)Br2]n (2) is a bromo bridged one-dimensional chain in which the non-chelated part of ligand L binds a neighbouring cadmium(II) centre resulting in an alternating array of four- and twelve-membered rings. [Cd(L)I2]n (3) is an iodo bridged one-dimensional network of alternating octahedral (CdN4I2) and tetrahedral cadmium(II) (CdI4) centres. Upon heating the complexes exhibit an irreversible endothermic phase transition [95–133 °C, ΔH = 29.5 kJ mol−1 for (1); 83–128 °C, ΔH = 22.5 kJ mol−1 for (2) and 91–128 °C, ΔH = 15.5 kJ mol−1 for (3)] yielding transparent films of CdLCl2 (1a), CdLBr2 (1b) and CdLI2 (1c) respectively. The derived species (1a, 1b and 1c) do not revert on keeping them in a humid atmosphere (relative humidity ≈ 60%) for several days but exhibit a glass transition upon heating.

Graphical abstract: Flexibility in co-ordinative behaviour of N-(3-hydroxypropyl)ethane-1,2-diamine toward cadmium(ii) halides: syntheses, crystal structures and solid state thermal studies

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Publication details

The article was received on 05 Jul 2001, accepted on 16 Nov 2001 and first published on 12 Feb 2002


Article type: Paper
DOI: 10.1039/B105984J
Citation: J. Chem. Soc., Dalton Trans., 2002,0, 1066-1071
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    Flexibility in co-ordinative behaviour of N-(3-hydroxypropyl)ethane-1,2-diamine toward cadmium(II) halides: syntheses, crystal structures and solid state thermal studies

    I. R. Laskar, G. Mostafa, T. K. Maji, D. Das, A. J. Welch and N. R. Chaudhuri, J. Chem. Soc., Dalton Trans., 2002, 0, 1066
    DOI: 10.1039/B105984J

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