Microwave-assisted synthesis, spectroscopy, and crystal structures of [(H2-(4,4'-bipy)]~(2+) [Cr2O7]~(2-) and one-dimensional polymeric {[Mn(4,4'-bipy)(Cr2O7)(H2O)2]}_n compounds

摘要

A compound (1), [H2-(4,4'-bipy)]~(2+) [(Cr2O7)]~(2-) and a metal organic-inorganic coordination framework (2), [Mn(4,4'-bipy)(Cr207) (H2O)2] (4,4'-bipy=4,4' -bipyridine) were successfully synthesized by microwave method. Their characterization was performed by single crystal X-ray crystallography and FT-IR spectroscopy. The crystal structure of 1 revealed a diprotonated 4,4'-bipyridium dichromate compound while compound 2 is an onedimensional (ID) polymer in which (Cr2O7)~(2-) acts as a bridging ligand supporting the formation of infinite {[Mn(4,4'-bipy)(Cr2O7)(H2O)2]}_n polymeric chains. The geometry of the 4,4'-bipy ring in 1 is typical coplanar, but twists in 2. In the free molecule 1, dichromate ligand adopts an eclipsed conformation, but adopts a staggered conformation in complex. The principal features of the crystal supramolecularity of 1 and 2 are non-covalent weak interactions which occurred via N-H···O and C-H··· O hydrogen bonding.