Synthesis and crystal structures of manganese (II) co-ordination compounds of large ring framework with a bidentate betaine derivative

A new bidentate betaine derivative 1, 5-bis(4-carboxypyridinium)-N-methyl-diethylamine (L) was prepared and allowed to react with manganese salts leading to the formation of one new manganese coordina-tion compounds {[MnL2Cl2]&middot2H2O}n which was structurally characterized by IR spectoroscopy, single-crystal X-ray diffraction. The single crystal X-ray diffraction structure analysis of these compounds shows the molecule consists of discrete 36-membered ring structure. Owing to lacking strong intermolecular interactions in these compounds, weak interactions determine their packing pattern in crystalline state, such as π-π stacking and hydrogen bonding interactions.