A novel cadmium-nicotinato linked square-basket metal-organic polymer displaying a thick covalent 2-D layer structure

• Mixed metal centered rings and cadmium-nicotinato linked square basket-like nets
• The structure displayed a novel thick 2-D layer covalent structure.
• The first nicotinato-linked mixed cobalt and cadmium polymer with novel structural features

The reactions of Cd(NO3)2⋅4H2O, Co(NO3)2.6H2O with nicotinic acid and 1,2-Di(4-pyridyl) ethylene under hydrothermal reaction conditions resulted in a metal-organic polymer [(H2O)Cd(C6H4O2N)2] 2[(C6H4O2N)2Co(H2O)2] 1. The compound 1 is the first nicotinato-linked mixed cobalt–cadmium compound displaying a square basket-like thick covalent 2-D layer structure.

Although many structures containing nicotinato bridges have been reported, the nicotinato structural linkages with mixed cobalt and cadmium metal centers in constructing network structures remain unexplored. Herein we report a novel double cadmium-nicotinato linked square-basket metal-organic polymer displaying a thick covalent 2-D layer structure containing six mixed Cd and Co metal centered rings: [(H2O)Cd(C6H4O2N)2]2 [(C6H4O2N)2Co(H2O)2] 1, the first nicotinato linked cadmium and cobalt mixed metal centered coordination polymer with distinct basket-like features and entangled thick layers. The fused four-metal-centered ring are showing square basket-like shape that are linked by two Cd-nicotinato bridged chains on the side when it is viewed down to the b axis, which ultimately resulted in a novel thick 2-dimensional covalent layer network structure. The Cd-nicotinato bridging chains in the two-dimensional network displayed six metal-centered rings that facilitate the complexity of the thick layer. The systematic research on the mixed metal coordination polymers is underway in our laboratory.Figure optionsDownload as PowerPoint slide