Bi(III) Complexes Containing Dithiocarbamate Ligands: Synthesis, Structure Elucidation by X-ray Diffraction, Solid-State 13C/15N NMR, and DFT Calculations

Abstract

We report on syntheses, characterisation by nuclear magnetic resonance (NMR) spectroscopy, X-ray diffraction (XRD) measurements, and density functional theory (DFT) calculations of electronic/molecular structure and NMR chemical shifts of complexes of Bi(III), having the molecular formulae: [Bi{S2CN(C2H5)2)}3] (1), [Bi{S2CN(C2H5)2)}2(C12H8N2)NO3)] (2), and [Bi2{S2CN(CH2)5}6 (Formula presented.) H2O] (3). The powder XRD patterns of complexes (1) and (2) resembled the corresponding calculated powder XRD patterns for previously reported single crystal structures. Single crystal XRD structure of complex (3), reported in this work, adopted an orthorhombic system with a space group Pbca with a=10.9956(3) Å, b=27.7733(8) Å, c=35.1229(10) Å and α=β=γ=90°. The experimental solid-state 13C/15N NMR data of the complexes (1)-(3) were in accord with their X-ray single crystal structures. The unit cell of the complex (3) shows a weak supramolecular Bi (Formula presented.) S interaction leading to the formation of a non-centrosymmetric binuclear molecule [Bi2{S2CN(CH2)5}6 (Formula presented.) H2O], which displays structural inequivalence in both 13C/15N NMR, and XRD data. Assignments of resonance lines in solid-state 13C/15N NMR spectra of complexes (1)-(3) were assisted by chemical shift calculations using periodic DFT methods. The findings of the present multidisciplinary approach will contribute in designing molecular models and further understanding of the structures and properties of (diamagnetic) metal complexes, including heavy metal ones.