Affiliations: [a] Department of Chemistry, Shah Jalal University of Science and Technology, Sylhet, Bangladesh
| [b] Pohang Accelerator Laboratory, POSTECH, Pohang, Republic of Korea
| [c] Department of Chemistry, Andong National University, Andong, Republic of Korea
Correspondence:
[*]
Corresponding author: Jong-Ha Choi, Department of Chemistry, Andong National University, Andong 36729, Republic of Korea. Tel.: +82 54 820 5458; Fax: +82 54 822 5452; E-mail: jhchoi@anu.ac.kr.
Abstract: A novel metal complex, [Cu(Lb)](NO3)2 [Lb = 2,13-dibenzyl-5,16-diethyl-2,6,13,17-tetraazatricyclo(16.4.0.07,12)docosane], was synthesized and characterized by single-crystal X-ray diffraction as well as other spectroscopic techniques. Structural analysis revealed that the copper(II) ion has an approximately square planar arrangement with stable trans-III configuration of the macrocyclic ligand. The Cu–N(tertiary) distance (2.0860 (14) Å) is greater than the Cu–N(secondary) distance (2.0229 (15) Å), which may be attributed to the steric effect of the benzyl group attached to the tertiary N atom. The nitrate anion and complex cation are linked by hydrogen bonds and weak Cu···O interactions. The metal complex showed strong blue luminescence when excited in the 355-391 nm region, and both blue as well as green emissions when excited in the 438–460 nm range.
