The synthesis of new monodentate heterocyclic ligands 5-(4-pyridyl)-2-alkyltetrazole (L1a,b) and 4-[5-(2-alkyltetrazole)]aryl-4'-pyridinecarboxylate (L2a,b,c) containing two or three aromatic or heterocyclic rings (tetrazole, pyridine and benzene) and preparation of their corresponding silver(I) and palladium(II) complexes (Ia,b,c and IIa,b,c) are described. The thermal behaviour of the ligands and complexes was characterized by polarizing optical microscopy. The ligands and the complexes Ia,b,c and IIc showed no liquid crystalline phase. The complexes IIa,b showed mesomorphic behaviour, exhibiting smectic A enantiotropic mesomorphism X-ray diffraction measurements for complex Ia showed monodentate coordination of N-pyridine, and no coordination on the nitrogen atoms of the tetrazole ring.
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Gallardo et al. (2001) studied this question.
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