From 1D to 2D Cd(II) and Zn(II) Coordination Networks by Replacing Monocarboxylate with Dicarboxylates in Partnership with Azine Ligands: Synthesis, Crystal Structures, Inclusion, and Emission Properties

Eight mixed-ligand coordination networks, [Cd(2-aba)(NO(3))(4-bphz)(3/2)](n)·n(dmf) (1), [Cd(2-aba)(2)(4-bphz)](n)·0.75n(dmf) (2), [Cd(seb)(4-bphz)](n)·n(H(2)O) (3), [Cd(seb)(4-bpmhz)](n)·n(H(2)O) (4), [Cd(hpa)(3-bphz)](n) (5), [Zn(1,3-bdc)(3-bpmhz)](n)·n(MeOH) (6), [Cd(1,3-bdc)(3-bpmhz)](n) ·0.5n(H(2)O)·0.5n(EtOH) (7), and [Cd(NO(3))(2)(3-bphz)(bpe)](n)·n(3-bphz) (8) were obtained by interplay of cadmium nitrate tetrahydrate or zinc nitrate hexahydrate with 2-aminobenzenecarboxylic acid (H(2-aba)), three dicarboxylic acids, sebacic (decanedioic acid, H(2)seb), homophthalic (2-(carboxymethyl)benzoic acid, H(2)hpa), isophthalic (1,3-benzenedicarboxylic acid, H(2)(1,3-bdc)) acids, bis(4-pyridyl)ethane (bpe) and with four azine ligands, 1,2-bis(pyridin-4-ylmethylene)hydrazine (4-bphz), 1,2-bis(1-(pyridin-4-yl)ethylidene) hydrazine (4-bpmhz), 1,2-bis(pyridin-3-ylmethylene)hydrazine (3-bphz), and 1,2-bis(1-(pyridin-3-yl) ethylidene)hydrazine (3-bpmhz). Compounds 1 and 2 are 1D coordination polymers, while compounds 3–8 are 2D coordination polymers. All compounds were characterized by spectroscopic and X-ray diffraction methods of analysis. The solvent uptakes and stabilities to the guest evacuation were studied and compared for 1D and 2D coordination networks. The de-solvated forms revealed a significant increase of emission in comparison with the as-synthesized crystals.