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

作　　者：Qianqian Guo Irmgard Kalf Ulli Englert 

机构地区：[1]Institute of Inorganic Chemistry, RWTH Aachen University, Aachen, Germany

出　　处：《Frontiers of Chemical Science and Engineering》2018年第3期433-439,共7页化学科学与工程前沿（英文版）

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）].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）].

关 键 词：ditopic ligand substituted acetylacetone DESOLVATION DIFFRACTION 

分 类 号：O121.5[理学—数学] S482.52[理学—基础数学]