Abstract
Inclusion of 3-hydroxynaphthalene-2-carboxylic acid in grid-like structure of a coordination-polymer 1 formed from 1,3-bis(4-pyridyl)propane (LL) with cadmium(II) chloride is described. Components of the grid are comprised of cyclic secondary building blocks of 4+4 condensation of LLs and cadmium ions. Guest 3-Hydroxynaphthalene-2-carboxylic acid (Hnap) molecules possess intramolecular hydrogen bonds and CH⋯π and OH⋯Cl interactions with host coordination polymer. Among four pyridyl rings coordinated to each cadmium ion, two pyridyl rings are distinguishable from other two pyridyl rings as they are involved in CH⋯Cl interactions. 1H NMR experiments show that Hnap has a role in formation of grid-like structure. A similar reaction of chelating ligand 2,2′-bipyridine and Hnap with cadmium chloride led to a mono-nuclear complex bis(2,2′-bipyridine)-bis(3-hydroxynaphthalene-2-carboxylato)cadmium(II) (2) which was structurally characterized.
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