Hydrothermal Synthesis, Structural Variations, and Catalytic Applications of Self-Assembled Coordination Polymers From a Novel Aminodicarboxylate Linker

In this study, a novel aminodicarboxylic acid, 4,4 '-(azanediylbis(methylene))dibenzoic acid (H2amda), was utilized as a versatile building block to synthesize a new series of coordination polymers (CPs) via hydrothermal methods. These polymers were represented by the following formulas [Ni(Hamda)2(mu-4,4 '-bipy)(H2O)(2)](n)<middle dot>2nH(2)O (1), [Co(Hamda)(mu-Hamda)(mu-dpey)(0.5)](n)<middle dot>nH(2)O (2), [Co(Hamda)(mu-Hamda)(mu-dpea)(0.5)](n)<middle dot>nH(2)O (3), [Zn(mu-amda)(phen)](n)<middle dot>0.5nH(2)amda<middle dot>nH(2)O (4), [M(mu-amda)(2,2 '-bipy)](n) (M = Co (5), Ni (6)), and [M(mu(3)-amda)(mu-bpb)](n)<middle dot>0.5nbpb<middle dot>nH(2)O (M = Co (7), Mn (8)). All synthesized compounds (1-8) were thoroughly characterized using elemental analysis, IR spectroscopy, thermogravimetric analysis (TGA), powder X-ray diffraction (PXRD), and single-crystal X-ray diffraction. The structural analysis revealed that compounds 1-6 exhibit one-dimensional (1D) metal-organic chains, whereas compounds 7 and 8 display two-dimensional (2D) metal-organic sheet structures. A topological classification of the underlying metal-organic networks was identified: 2C1 topology in compounds 1 and 4-6, (4,4)(0,2) topology in compounds 2 and 3, and a new topology in compounds 7 and 8. The catalytic performance of compounds 1-8 were evaluated through cyanosilylation reactions under mild conditions, optimizing diverse reaction parameters and exploring substrate scope. Among the compounds tested, compound 2 demonstrated the highest efficiency as a recyclable heterogeneous catalyst, achieving up to 98% product yield.