Zero-, one-, two- and three-dimensional coordination polymers based on tetracarboxylic acid: Syntheses, structures, magnetic and luminescent properties

• A series of coordination polymers have been prepared.
• The coordination polymers are assembled form low-dimensional structures into three-dimensional frameworks through intermolecular forces.
• Coordination polymer 3 displays selective recognition towards L-Arginin.

A series of coordination polymers, namely, {[Co(H2ttac)(phen)2]4H2O}n (1), {[Zn(H2ttac)(phen)2]4H2O}n (2), [Cu(H2ttac)(phen)]n (3), [Zn2(ttac)(DMZ)H2O]n (4), and [Cd(ttac)(phen)H2O]n (5)(H4ttac = 4,5-di(3'-carboxylphenyl)-phthalic acid, phen = 1,10-phenanthroline, DMZ = Dimidazole) have been prepared under hydrothermal conditions and characterized by elemental analysis, IR spectroscopy, and single crystal X-ray diffraction. Structural analysis reveals that the as-synthesized coordination polymers have different structures, ranging from zero-(1 and 2), one-(3), two-(4) to three-(5) dimensions, which are mainly due to the different metal ions, the degree of deprotonation and coordination modes of the H4ttac ligands. It is worth mentioning that, based on the diversified π–π stacking and/or C–H···π interactions between H4ttac ligands and/or nitrogen-containing auxiliary ligands, 1–4 are assembled form low-dimensional structures into three-dimensional (3D) frameworks. Especially, Jahn-Teller effect occurs in 3 and its magnetic study confirms that it presents antiferromagnetic coupling through the (O2C-Ar-Ar-CO2)2 bridges. Significantly, luminescent emission of 3 displays selective recognition towards L-Arginin. Thermogravimetric (TG) analyses of the coordination polymers have also been investigated.

A series of coordination polymers, namely, {[Co(H2ttac)(phen)2]4H2O}n (1), {[Zn(H2ttac)(phen)2]4H2O}n (2), [Cu(H2ttac)(phen)]n (3), [Zn2(ttac)(DMZ)H2O]n (4), and [Cd(ttac)(phen)H2O]n (5)(H4ttac = 4,5-di(3'-carboxylphenyl)-phthalic acid, phen = 1,10-phenanthroline, DMZ = Dimidazole) have been prepared under hydrothermal conditions and characterized. Structural analysis indicates that coordination polymers 1–4 are assembled from low-dimensional structures into three-dimensional frameworks. The luminescent emission of 3 displays selective recognition towards L-Arginin.Figure optionsDownload as PowerPoint slide