Embrace interlocking of dipyrazinylpyridine complexes involving N center dot center dot center dot pi interactions

作者：Dai, Jing Wei; Li, Ben Zhen; Chen, Ying Lin; Huang, Guang; Cai, Bin; Yu, Ying; Wu, Jian Zhong^*

来源：Inorganic Chemistry Communications, 2010, 13(5): 625-629.

DOI：10.1016/j.inoche.2010.03.004

• Crystal structure
• N center dot center dot center dot pi interaction
• C-H center dot center dot center dot pi hydrogen bond
• Electronic absorption
• Fluorescence

Fe(II) and Ni(II) complexes of 4-p-tolyl-2,6-di(2-pyrazinyl)pyridine (tdpzpy) have been synthesized and characterized. The N center dot center dot center dot pi interaction involving the uncoordinated pyrazinyl N atom, which is stronger than the corresponding C-H center dot center dot center dot pi hydrogen bonding in a similar 4-p-tolyl-2,2':6'.2 ''-terpyridine complex, was distinguished as a supramolecular motif. It acts as an edge-to-face force in assembling cations of [Fe (tdpzpy)2](2 ) or [Ni(tdpzpy)(2)](2 ) into chains via embrace interlocking. C-H center dot center dot center dot pi hydrogen bonds further link the chains into higher dimension net. The electronic absorption and emission properties of [Fe(tdpzpy)(2)](2 ) and [Ni(tdpzpy)(2)](2 ) are largely ligand-centered. [Fe(tdpzpy)(2)](2 ) displays an MLCT absorption at 567 nm. The fluorescence of [Ni(tdpzpy)(2)](2 ) is different markedly in methanol and acetonitrile. The ligand-based fluorescence is quenched to some extent by coordination to the d-orbital unfulfilled Fe(II) or Ni(II) atom.

• 出版日期2010-5
• 单位华南师范大学