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

Authors : Hirihattaya PHETMUNG, Munee WATEH, Chaveng PAKAWATCHAI

Pages : 556-566

Doi:10.3906/sag-1211-66

View : 22 | Download : 7

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :A compound insert ignore into journalissuearticles values(1);, [H2-insert ignore into journalissuearticles values(4,4`-bipy);]2+[insert ignore into journalissuearticles values(Cr2O7);]2- and a metal organic-inorganic coordination framework insert ignore into journalissuearticles values(2);, [Mninsert ignore into journalissuearticles values(4,4`-bipy);insert ignore into journalissuearticles values(Cr2O77);insert ignore into journalissuearticles values(H2O);2] insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(1D); polymer in which insert ignore into journalissuearticles values(Cr2O7);2- acts as a bridging ligand supporting the formation of infinite {[Mninsert ignore into journalissuearticles values(4,4`-bipy);insert ignore into journalissuearticles values(Cr2O7);insert ignore into journalissuearticles values(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.
Keywords : Microwave assisted synthesis, organic inorganic framework, diprotonated 4, 4` bipyridium, eclipsed conformation