Crystal Structure and Supramolecular Architecture of Inorganic Ligand-Coordinated Salen-Type Schiff Base Complex: Insights into Halogen Bond from Theoretical Analysis and 3D Energy Framework Calculations

Crystals

Hui Tian¹  Xindi Xu¹  Mei-Fen Huang¹  Qiong Wu¹  Jian-Chang Xiao¹  Jin-Rong Sun¹  Tianyu Li¹  Cun Zhou² 

[1] Department of Chemistry and Chemical Engineering, Kunming University, Kunming 650214, Yunnan, China;High School Affiliated to Minzu University of China Kunming Wuhua Experimental School, 6 Chenjiaying Road, Wuhua District, Kunming 650102, Yunnan, China;

关键词: halogen bond;    Schiff-base complex;    DFT studies;    charge distribution;    Hirshfeld surfaces;    supramolecular networks;   

DOI  :  10.3390/cryst10040334

来源: DOAJ

【 摘 要 】

To identify the effects of halogen bonding in the architecture of Schiff base complex supramolecular networks, we introduced halogenated Schiff-base 3-Br-5-Cl-salen as ligand and isolated a new salen-type manganese(III) complex [Mn^III(Cl)(H₂O)(3-Br-5-Cl-salen)] (1) where 3-Br-5-Cl-salen = N,N’-bis(3-bromo-5-chlorosalicylidene)-1,2-diamine. The complex was investigated in the solid-state for halogen bonds (XBs) by single crystal X-ray structure analysis. Meanwhile, theoretical calculations were carried out to rationalize the formation mechanism of different types of XBs in the complex. The analysis result of electronic structure of the halogen bonds indicated that the chlorine atom coordinated to the Mn(III) center possesses the most negative potential and acts as anionic XB acceptor (electron donor) to the adjacent substituted halogens on the ligand, meanwhile the intermolecular Mn-Cl···X-C halogen bonding plays a significant role in directing the packing arrangement of adjacent molecules and linking the 2D layers into a 3D network. In order to verify the above results and acquire detailed information, the title complex was further analyzed by using the Hirshfeld surface analyses.

【 授权许可】

Unknown