Tuning the silver(I) complexes of 3-(2-pyridyl)pyrazole-based ligands: Syntheses and crystal structures of the complexes, as well as theoretical investigations on the coordination abilities of the ligands
作者:Chun-Sen Liu、Jian-Rong Li、Ru-Qiang Zou、Jiang-Ning Zhou、Xue-Song Shi、Jun-Jie Wang、Xian-He Bu
DOI:10.1016/j.molstruc.2006.12.026
日期:2007.10
In our efforts to investigate the influences of different pendant aromatic groups and the spatial position of N donors in 3-(2-pyridyl)pyrazole-based ligands on the structures of their metal complexes, five structurally related ligands: 1-[3-(2-pyridyl)pyrazol- 1-ylmethyl]benzene (L-1), 1-[3-(2-pyridyl) pyrazol-1-ylmethyl]naphthalene (L-2), 8-[3-(2-pyridyl)pyrazol-1-ylmethyl]quinoline (L-3), 3-[3-(2-pyridyl)pyrazol-1-ylmethyl]pyridine (L-4) and 4-[3-(2- pyridyl)pyrazol-1-ylmethvl]pyridine (L-5), have been used to react with AgCl4 to form five Ag(I) complexes, [Ag(L-1)(2)](ClO4) (1), [Ag(L-2)(2)](ClO4) (2), [Ag(L-3)(HL3)](ClO4)(2)(CH3CN) (3), [Ag(L-4)](ClO4)}(2) (4), and [Ag(L-5)]ClO4)}(infinity) (5). The structural differences of these complexes may be attributed to the coordination geometries or N donor position of the pendant aromatic groups in ligands L-1-L-5. Also, the result reveals that various intra- and/or inter-molecular weak interactions, such as pi center dot center dot center dot pi stacking, C-H center dot center dot center dot pi and C-H center dot center dot center dot O H-bonding interactions, play important roles in the formation of 1-5, especially in the aspect of linking the multi-nuclear discrete subunits or low-dimensional entities into high-dimensional frameworks. Moreover, the coordination behaviors of ligands L-1-L-5 have been briefly evaluated by DFT calculations. (c) 2007 Elsevier B.V. All rights reserved.