Abstract
Four new coordination polymers (CPs), {[Zn2(L)4]·7H2O}n (1), {[Zn2(L)4]·4H2O}n (2), {[Zn(L)2]·3/2H2O}n (3) and {[Cd(L)2]·3H2O}n (4) (HL=4-benzoimidazol-1-yl-methyl benzoic acid) have been synthesized under hydrothermal conditions. All the complexes have been characterized by single crystal X-ray crystallography (XRD), IR spectroscopy, elemental analysis and thermogravimetry (TGA). Complexes 1–4 show similar 2D, non-interpenetrated, uninodal 4-connected layers that are further connected by H-bonding interactions to 3D supramolecular structures. For the complexes 1–3, the overall architecture is controlled by the template used. All complexes exhibit high thermal stability losing coordinated water molecules at ∼110°C. Upon excitation at 343nm, compounds 1–3 exhibit solid-state luminescence at room temperature. The intensity of luminescence gradually decreases with an increase in the number of lattice water molecules per Zn(II) center due to vibrational quenching by water molecules.
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