Copper(II) complexes with N,O-coordinating thiopseudoureas: syntheses, structures, and properties

Abstract

Syntheses, characterization, and physical properties of two complexes of copper(II) having the general molecular formula [Cu(Lⁿ)₂] (1 and 2) with benzyl-N′-(4-R-benzoyl)-N-(2,6-diisopropylphenyl)carbamimidothioates (HLⁿ, where n = 1 and 2 for R = H and Cl, respectively) are reported. Both complexes were characterized by mass spectrometric, magnetic susceptibility, and various spectroscopic (IR, UV–Vis, and EPR) measurements. The molecular structures of 1 and 2 were established by single crystal X-ray crystallographic studies. In each complex, the bivalent metal center is in a near perfect square-planar trans-N₂O₂ coordination environment assembled by two bidentate six-membered chelate rings forming iminolate-O and azomethine-N donor (Lⁿ)⁻ ligands. In the crystal lattice, the packing of 1 is according to the symmetry operations, while intermolecular π⋯π and C–H⋯π interactions assisted self-assembly of 2 leads to a two-dimensional sheet-like structure. Mass spectrometric and infrared and electronic spectroscopic data are in agreement with their molecular formulas and similar structures. The room temperature magnetic moments and EPR spectra of both complexes are consistent with the S = ½ ground state and the square-planar coordination geometry of the metal ion in each complex.

KEYWORDS:

• Copper(II) complexes
• thiopseudourea
• NO-donor
• crystal structures
• properties

Acknowledgements

K.S. thanks the University Grants Commission (UGC), New Delhi, for a research fellowship (No. 187/(CSIR-UGC NET June 2017). S.N. thanks the UoH-IoE for a research fellowship. G.B. thanks the UGC, New Delhi for the Dr. D.S. Kothari postdoctoral fellowship (No. F. 4‐2/2006(BSR)/CH/20-21/0246).

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

Financial support to the University of Hyderabad-Institution of Eminence (UoH-IoE) from the Ministry of Education, Government of India (Grant No. F11/9/2019-U3(A)) is gratefully acknowledged.