Influence of tetrahedral distortion of CuN4 complexes on spectroscopic properties. Synthesis, characterization and crystal structures of [Cu(N-(2-methylpyridyl)benzenesulfonylamidate)2], [Cu(N-(2-methylpyridyl)toluenesulfonylamidate)2] and [Cu(N-(2-methylpyridyl)naphthalenesulfonylamidate)2] compounds
A series of new N-sulfonamide ligands and their copper(II) complexes, [Cu(N-(2-methylpyridyl)toluenesulfonylamidate)(2)] (1), [Cu(N-(2-methylpyridyl)benzenesulfonylamidate)(2)] (2) and [Cu(N-(2-methylpyridyl)naphthalenesulfonylamidate)(2)] (3), have been synthesized and characterized. Single crystal X-ray analysis of the three-complexes revealed that all of them present a tetracoordinate CuN4 chromophore. The ligands act as bidentate, coordinating the metal ion through the pyridine and sulfonamido N atoms. The main structural difference among the compounds is the varied degree of distortion of square-planar stereochemistry. Complex 1 exhibits a regular square-planar geometry. In complexes 2 and 3 the tetrahedrality values of 50.2 degrees and 39.0 degrees respectively indicate a strong distortion. EHMO calculations on idealized models show the correlation between the geometrical distortion and the spectroscopic properties. (C) 2001 Elsevier Science B.V. All rights reserved.
ABA Receptor Agonists for Increased Plant Stress Resistance
申请人:Xu Yong
公开号:US20130045952A1
公开(公告)日:2013-02-21
The present invention relates to ABA agonist compounds which increase plant stress resistance. The invention also relates to methods of using these compounds. The invention further relates to compositions and formulations comprising the ABA agonist compounds, and uses thereof.
Strong Ferromagnetic Coupling in Linear Mixed μ-Acetato, μ-Hydroxo Trinuclear Copper(II) Complexes withN-sulfonamide derivatives − Synthesis, Structure, EPR and Magnetic Properties
作者:Laura Gutierrez、Gloria Alzuet、Jose A. Real、Joan Cano、Joaquin Borrás、Alfonso Castiñeiras