Interaction of Methylmercury(II) with N-Substituted Pyrazoles. Sigma-Donor Ability of Pyridines, Imidazoles, and Pyrazoles
Interaction of Methylmercury(II) with N-Substituted Pyrazoles. Sigma-Donor Ability of Pyridines, Imidazoles, and Pyrazoles
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甲基汞(II) 与N-取代吡唑的相互作用。
DOI：
10.1021/om00068a012
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发表时间：
1982
期刊：
影响因子：
2.8
通讯作者：
Christopher V. Lee
中科院分区：
文献类型：
--
作者：
A. Canty;Christopher V. Lee
N-取代吡唑(L)形成[MeHgL]NO络合物，其2J(1H-199Hg)随L碱度的增加而减小，这与密切相关的N-取代咪唑络合物非常相似。这些关系不同于吡啶络合物的关系，这表明对于相似对数KH的配体(在50%二恶烷-水中的PKA)，N-取代的咪唑和吡唑是甲基汞(II)的更好的Sigma供体。在甲醇中，配合物[MeHgL]NO3[L=N-(2-吡啶)吡唑和双(N-吡唑)甲烷]与甲基汞(II)发生络合反应。
N-Substituted pyrazoles (L) form complexes [MeHgL]NO, for which 2J(1H-199Hg) decreases with increasing basicity of L in a very similar manner to that observed for closely related N-substituted imidazole complexes. The relationships differ from that for complexes of pyridines and suggest that for ligands of similar log KH (pKa of LH+ in 50% dioxane-water) the N-substituted imidazoles and pyrazoles are better sigma donors toward MeHg(II) than pyridines. The complexes [MeHgL]NO3 [L = N-(2-pyridyl)pyrazole and bis(N-pyrazoly1)methane] have the ligands chelated to MeHg(II) when in methanol.