二次变形：配位多面体中变形的定量度量。
Quadratic elongation: a quantitative measure of distortion in coordination polyhedra.
出版信息
Science. 1971 May 7;172(3983):567-70. doi: 10.1126/science.172.3983.567.
PMID:17802221
Abstract
Quadratic elongation and the variance of bond angles are linearly correlated for distorted octahedral and tetrachedral corrdination complexes, both of which show variations in bond length and bond angle. The quadratic elongation is dimensionless, giving a quantitative measure of polyhedral disortion which is independent of the effective size of the polyhedron.
摘要
对于扭曲的八面体和四面体型配位络合物，二次伸长和键角的方差呈线性相关，这两种络合物都表现出键长和键角的变化。二次伸长是无量纲的，它定量地衡量了多面体的畸变程度，而与多面体的有效大小无关。
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