| Abstract |
This work explores an N,O-donor dicarboxylic acid, 5-(3-carboxyphenyl)picolinic acid (H(2)cpic), as an adjustable linker for generating diverse types of coordination polymers (CPs). Eight new compounds were hydrothermally assembled, completely characterized, and formulated as [Mn(mu(3)-cpic)(H2O)(2)](n) (1), [Cd-2(mu(3)-cpic)(mu(4)-cpic)(H2O)(2)](n) (2), [Cd(mu(4)-cpic)](n) (3), [Mn(mu-cpic)(phen)(H2O)](n) (4), [Zn(mu-cpic)(phen)](n)center dot nH(2)O (5), [Cd-2(mu-cpic)(2)(phen)(2)(H2O)]center dot 3H(2)O (6), [Cd(mu(3)-cpic)(phen)](n) (7), and [Zn-2(mu-cpic)(2)(bipy)(H2O)(2)](n)center dot 4nH(2)O (8). Products 1-8 were assembled from H2O solutions containing the respective metal(II) chloride salts, H(2)cpic, NaOH, and an N-donor crystallization mediator (optional: 1,10-phenanthroline, phen; or 2,2 -bipyridine, bipy). The structural types of 1- 8 include a dimer complex (6), one-dimensional (1, 4, 5, 7, 8) and two-dimensional (2) CPs, and a three-dimensional (3) metal-organic framework. Hydrothermal reaction temperature, type of metal(II) center, and presence of mediators of crystallization are the factors responsible for structural diversity of 1-8. Thermal behavior, topological features, and catalytic properties of these products were studied. Notably, CP 1 acts as an effective, stable, and recyclable catalyst for the heterogeneous cyanosilylation of different aldehydes under mild conditions, resulting in quantitative conversion of aldehyde substrates to respective cyanohydrin products (99\% product yields). Compounds 1-8 expand the usage of H(2)cpic for the assembly of functional coordination polymers, thus stimulating further research in this swiftly growing field. |
