Crystal-to-crystal transformation from the triclinic to the cubic crystal system by partial desolvation

作     者：Qianqian Guo Irmgard Kalf Ulli Englert 

作者机构：Institute of Inorganic Chemistry RWTH Aachen University Aachen Germany 

出 版 物：《Frontiers of Chemical Science and Engineering》 (化学科学与工程前沿（英文版）)

年 卷 期：2018年第12卷第3期

页      面：433-439页

核心收录：

学科分类：090403[农学-农药学(可授农学、理学学位）] 07[理学] 0817[工学-化学工程与技术] 09[农学] 0904[农学-植物保护] 0703[理学-化学] 0701[理学-数学] 

基　　金：Financial support by China Scholarship Council (Qianqian. Guo) is gratefully acknowledged 

主　　题：ditopic ligand substituted acetylacetone desolvation diffraction 

摘      要：Diffusion reaction of the labile building block Mg（acacCN）2 （acacCN= 3-cyanoacetylacetonate） with silver salts leads to a series of solvated Mg/Ag bimetallic coordination polymers with composition [Mg（acacCN）aAg].solvent. Despite their common stoichiometry, the topology of these polymers depends on the solvent of crystallization. The two-dimensional coordination compound [Mg（acacCN）aAg]-4CHCl3 in space group P]- is obtained as platelet-shaped crystals from a mixture of methanol and chloroform. When kept in the reaction mixture, these thin plates within one week convert to isometric tetrahedral crystals of the 3D network [Mg（acacCN）3Ag]. 2CHC13 in the cubic space group/9213. The transformation reaction proceeds via dissolution and recrystallization. The co-crystallized solvent molecules play an important role for stabilizing the target structure： They subtend Cl...Cl contacts and interact via non- classical C-H.-. O hydrogen bonds with the coordination framework. In the new cubic coordination network, both Mg（II） and Ag（I） adopt octahedral coordination, with unprecedented face-sharing by bridging O atoms of three acetylacetonato moieties. Prolonged standing of [Mg（acacCN）3Ag]-2CHCl3 in the reaction medium leads to further degradation, under formation of [Ag（acacCN）].