Synthesis and characterization of macrocyclic nickel(II) complexes with α-methylbenzyl groups as chiral pendants |
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| Authors: | Jeong Hyeong Han Min Ju Cha Bong Gon Kim Seog K Kim Kil Sik Min |
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| Affiliation: | aDepartment of Chemistry Education, Kyungpook National University, Daegu 702-701, Republic of Korea;bDepartment of Chemistry Education and Research Institute of Natural Science, Gyeongsang National University, Jinju 660-701, Republic of Korea;cDepartment of Chemistry, Yeungnam University, Kyongsan 712-749, Republic of Korea |
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| Abstract: | Novel nickel(II) hexaaza macrocyclic complexes, Ni(LR,R)](ClO4)2 (1) and Ni(LS,S)](ClO4)2 (2), containing chiral pendant groups have been synthesized by an efficient one-pot template condensation and characterized (LR,R/S,S = 1,8-di((R/S)-α-methylbenzyl)-1,3,6,8,10,13-hexaazacyclotetradecane). The crystal structures of 1 and 2 were determined by single-crystal X-ray analysis. Each complex has a square-planar coordination environment for the nickel(II) ion, and is either an R or an S enantiomorph depending on the pendant groups. The circular dichroism spectrum of 1 showed a negative, positive and negative peak at 345, 440, and 492 nm, respectively, and that of 2 exhibited an enantiomeric pattern. |
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| Keywords: | Chirality Circular dichroism Nickel(II) complex Macrocyclic ligand Crystal structure |
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