Stereochemistry of Pb(II) complexes with aminopolycarboxylic ligands. The role of a lone electron pair
Stereochemistry of Pb(II) complexes with aminopolycarboxylic ligands. The role of a lone electron pair
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DOI：
10.1007/s11173-005-0120-4
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发表时间：
2005-07-01
影响因子：
1.9
通讯作者：
Davidovich, RL
中科院分区：
文献类型：
--
作者：
Davidovich, RL
The structures of complex anions of Pb(II) coordination compounds (complexonates) with monoamino-, diamino, and polyaminopolycarboxylic acids as ligands were interpreted in terms of a model of the valence shell electron pair repulsion. A lone electron pair (E) in all structurally studied Pb(II) complexonates with carboxyl-containing complexones was shown to be stereochemically active, and the structure of Pb coordination polyhedron was found to depend on both the ligand dentate number and on its degree of protonation. As the ligand dentate number increased, the coordination number (C.N.) of a central atom changed from 4 + E for monoamine complexonates to 6 + E for diamine and triamine complexonates. With allowance for secondary bonds in the structure, the C.N. of the Pb atom increased to 7-9. The Pb(II) complexonates with nitrilotriacetic acid exhibit the formation of a new type of coordination polyhedron for post-transition elements in a low-valent state with five electron pairs in a valence shell (including one lone electron pair), i.e., the psi-trigonal bipyramid with E in the axial position.
