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急求其中文翻译！！！
3,5-Dimethyl-4-(40-pyridyl)pyrazole, prepared by the reaction of 3-(4-pyridyl)pentane-2,4-dione with hydrazine hydrate, reacts
with R2SnCl2 (R = Ph, Et and n-Bu) in a 1:1 ratio to yield 2:1 (ligand:tin) adducts. In the crystal structure of the Ph2SnCl2 adduct,
two 3,5-dimethyl-4-(40-pyridyl)pyrazole ligands coordinate to the tin atom through the pyridyl nitrogen atom instead of the pyrazolyl
nitrogen atom, and the molecules are connected into a linear chain through intermolecular N–H N hydrogen bonds. The
reaction of 3,5-dimethyl-4-(40-pyridyl)pyrazole with dibromomethane under phase transfer catalytic conditions affords bis[3,5-
dimethyl-4-(40-pyridyl)pyrazol-1-yl]methane. Treatment of this potential polydentate ligand with R2SnCl2 yields 1:1 adducts, in
which bis[3,5-dimethyl-4-(40-pyridyl)pyrazol-1-yl]methane coordinates to the tin atom through the pyridyl nitrogen atom to form
six-coordinate diorganotin linkage coordination polymers, leading to a bridging instead of a general chelating metal coordination.
In all new complexes, the pyridyl nitrogen atom exhibits stronger donating ability than the pyrazolyl nitrogen to the tin atom. |
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