Synthesis, characterization, crystal structure, Hirshfeld surface analysis and spectroscopic properties of bis(5-aminoisophthalato) bispicolinecopper (II)

Abstract

The 2D coordination polymer of Cu(II), [Cu(5-aip) (3-pic)(2)](n) (5-aip = 5-aminoisophthalato, 3-pic = 3-picoline) was characterized by elemental analysis, FT-IR and UV-Vis spectroscopy and single crystal XRD techniques. The X-ray single crystal data revealed that the polymeric coordination complex crystallizes in the monoclinic system with P2(1)/n space group and Cu(II) ion has five (square pyramidal) coordination number. X-ray diffraction analysis show that Cu(II) has a distorted square pyramidal geometry with tau = (175.75-160.0)/60) = 0.2625. Hirshfeld surface analysis was carried out, which reveals the nature of intermolecular contacts, the fingerprint plots and molecular surface contours (d(norm), d(i) and d(e)) provide the information about the percentage contributions [H center dot center dot center dot H (40.5%), C center dot center dot center dot H (29.2%), Cu center dot center dot center dot O (4.7%), N center dot center dot center dot H (4.9%), N center dot center dot center dot O (1.5%) and O center dot center dot center dot H (17.4%)] and revealed them major and minor contributions of the bond interactions for [Cu(5-aip) (3-pic)(2)](n) complex. According to UV-Vis spectrum, d-d transition observed at 712 nm (epsilon = 65 dm(3)mol(-1)cm(-1)) which is assigned to the d(z)(2) (a(1)) -> d(x-y)(22) (b(1)) transition. Thermogravimetric analysis was carried out to fallow the thermal stability of the complex. (C) 2020 Elsevier B.V. All rights reserved.