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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
catena-Poly[[[4-bromo-2-(2-pyridylmethyliminomethyl)phenolato]zinc(II)]-mu-chloro]
1Department of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, People's Republic of China. youzhonglu@yahoo.com.cn
Abstract:
The title complex, [Zn(C13H10BrN2O)Cl]n, is a chloride-bridged polynuclear zinc(II) compound. Each ZnII ion is five-coordinated in a square-pyramidal configuration, with one O and two N atoms of one Schiff base and one bridging Cl atom defining the basal plane, and another bridging Cl atom occupying the apical position. The novelty of the compound lies in the bridging by chlorine of two square-pyramidal Zn atoms, so that the bridging atom is apical for one Zn ion and basal for the other. This structural arrangement has not been observed before. The linked moieties form polymeric zigzag chains running along the a axis.
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Structural Isomerism
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...