Three-Dimensional Heterometallic Coordination Networks: Syntheses, Crystal Structures, Topologies, and Heterogeneous Catalysis

This work presents the synthesis
of {Co3+-Zn2+} and {Co3+-Cd2+} heterometallic coordination
networks. These networks are originated from two unique Co3+-based metalloligands containing appended arylcarboxylic acid groups
at the strategically placed positions. Such appended arylcarboxylate
groups coordinate the secondary metal ions, Zn2+ and Cd2+, to afford distinct three-dimensional networks. All four
networks display orderly arrangement of secondary metal ions and unique
network topologies including an unprecedented one. These networks
have been shown to act as the heterogeneous and reusable catalysts
for the Knoevenagel condensation reactions and cyanation reactions
of assorted aldehydes. Cyanation reactions nicely demonstrate the
substrate size-exclusion catalysis.