Chloridobis[2-(pyridin-2-yl-κN)benzo[b][1,5]naphthyridine-κN ¹]copper(II) perchlorate acetonitrile disolvate

Abstract

The copper(II) ion in the title complex, [CuCl(C 17 H 11 N 3 ) 2 ]ClO 4 Á2CH 3 CN, is coordinated by four N atoms from two pbn ligands and one Cl À ion in a distorted trigonal-bipyramidal geometry ( = 0.84). The asymmetric unit comprises half of the cationic complex molecule, and complete molecules are generated by twofold rotation symmetry with the corresponding axis running through the Cu atom and the coordinating Cl atom. The perchlorate anion is also located on a twofold rotation axis (passing through the Cl atom). In the crystal, there are -stacking interactions between the benzonaphthyridine rings of the pbn ligand of neighbouring cations. Structure descriptionUnderstanding the relationship between coordination geometry and reactivity of complexes containing the NAD + /NADH-analogous ligand pbn [pbn = 2-(pyridin-2-yl)benzo [b] [1,5]naphthyridine] is of great interest and importance in order to develop a photorenewable hydride reagent. In our previous studies, photocatalytic CO 2 reduction using the pbn complex has proved to be successful (Ohtsu & Tanaka, 2012), and control over the reaction rate of the CO 2 hydride reduction using a pbn complex has been accomplished by tuning of the basicity of the bases (Ohtsu et al., 2015). As part of our ongoing research on transition-metal complexes containing a pbn ligand, we have synthesized a new copper(II) pbn complex and its structure determination has been undertaken.