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| Syntheses, Crystal Structures, Hirshfeld Surface Analysis of Two Salen-Type Halogenated Schiff-Base Ni(Ⅱ) Complexes |
| Author Name | Affiliation | E-mail | | WU Qiong | College of Chemistry and Chemical Engineering, Kunming University, Kunming 650214, China
Yunnan Engineering Technology Research Center for Plastic Films, Kunming 650214, China | wuqiongkm@163.com | | TANG Ya-Fang | College of Chemistry and Chemical Engineering, Kunming University, Kunming 650214, China | | | ZI Qiao-Li | College of Chemistry and Chemical Engineering, Kunming University, Kunming 650214, China | |
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| Abstract: The reaction between nickel nitrate and halogenated salen-type Schiff-base ligand in methanol solution led to the isolation of two new salen nickel(Ⅱ) complexes[Ni(3,5-Cl-salcy)] (1) and[Ni(3-Cl-salcy)] (2), where 3,5-Cl-salcyH2=N,N'-(±)-bis(3,5-dichlorosalicylidene)cyclohexane-1,2-diamine and 3-Cl-salcyH2=N,N'-(±)-bis(3-chloro-salicylidene)cyclohexane-1,2-diamine. The crystal structures of complexes 1 and 2 were structurally characterized by single-crystal X-ray diffraction. Structural analysis reveals that the basic units of both complexes all consist of one nickel(Ⅱ) ion in[N2O2] coordination sphere, forming similar square planar geometries. PLATON software analysis indicates that there is not any hydrogen bond exists in the crystal structure of 1, and only unclassical hydrogen bonds exist in 2. However, Hirshfeld surface analysis shows that, although the strength of halogen atoms formed hydrogen bonds are weak, the C-H…X bonds play an important role in stabilization of three-dimensional networks of both complexes. Moreover, by comparison of the two complexes, we found that the difference in the number of halogen atoms in the ligand can have a very important influence on the proportion of weak exchange in the crystal. |
| Keywords: halogenated Schiff-base crystal structure weak molecular interactions Hirshfeld surface analysis |
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| WU Qiong,TANG Ya-Fang,ZI Qiao-Li.Syntheses, Crystal Structures, Hirshfeld Surface Analysis of Two Salen-Type Halogenated Schiff-Base Ni(Ⅱ) Complexes[J].Chinese Journal of Inorganic Chemistry,2019,35(8):1477-1484. |
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