In situ hydrothermal synthesis of two novel Cd(II) coordination compounds

Abstract Hydrothermal in-situ reactions of 4,4′-bis(3,3′-dicyano)pyridine (pydcy) with Cd(NO 3 ) 2 ·6H 2 O under the similar reaction condition but different solvent media result in two new compounds [C 48 H 32 Cd 2 N 8 O 18 ]( 1 ) and [C 17 H 13 CdN 3 O 5 ]( 2 ). Compound 1 features a new dimeric carboxylate bridged structure, while compound 2 gives a 3D framework with large hexagon channels embodied with water molecules. Topology analysis of 2 defines a type of {8 3 } etb topology. TGA and XRPD analysis indicated that the guest water molecules in 2 can be removed to result in a nanoporous network. Both compounds exhibit intense fluorescence at room temperature, which may originate from the ligand-to-metal charge transfer (LMCT) state.