1D-Coordination Polymer of Copper(I) Thiocyanate complex with Metronidazole: Synthesis, Crystal Structure, Hirshfeld surface analysis, PXRD, Spectroscopic properties, MEP, QTAIM, π(CN)···tetrel interaction, RDG, and Thermal Analysis
Journal of Molecular Structure(2024)
摘要
Within 24 hours of slow evaporation of the solution containing CuCl2.2H2O, metronidazole, and NH4SCN, a red-like crystalline Cu(I) complex titled [Cu(SCN)(mnz)]n (1), [where mnz = metronidazole; SCN = thiocyanate], was synthesized. The presence of SCN− during the synthesis induces reduction of the Cu(II) to Cu(I) giving rise to novel 1D coordination polymer. The compound was characterized by single crystal X-ray diffraction, powdered X-ray diffraction, spectroscopic proprieties, and Hirshfeld surface analysis. [Cu(SCN)(mnz)]n crystallizes in the monoclinic space group P21/c. The complex possesses a 1D layer structure constructed by linking the staircase-like [CuSCN]n chains. Intermolecular interactions in the crystals investigation via Hirshfeld surface analysis reveals the major contribution is from O···H/H···O interaction (22.9%), which is due to the presence of hydrogen bonds of the O−H···O type. The thermal properties were investigated using DTA-TGA and DSC. The study comprises the interpretation of non-covalent interactions through Quantum Theory of Atoms in Molecules (QTAIM), Natural Bond Orbital (NBO) analyses, and Reduced Density Gradient (RDG). The results show the role of interactions between SCN− and mnz through multiple connections involving the oxygen, nitrogen, and sulfur lone pairs and π-bonds for constructing the unit cell. The non-covalent arrangements include very weak hydrogen bonds that cooperatively stabilize the crystal. Along with SCN− bridging copper atoms, growth in the ab plane is favored by an uncommon π···π interaction between SCN− and the imidazole ring of mnz. In this interaction, the π(SN) and π(CN) orbitals perturb the imidazole π(CN) orbital with energies of 0.36 and 0.22 kcal/mol, respectively. In the c direction, a hydrogen bond between the hydroxyl group and CH- fragment from different mnz molecules assists structure stabilization. It is accompanied by a rarely observed π(CN)···tetrel interaction, wherein SCN− donates π-electron density to the antibonding σ(CH) orbital of the methyl carbon.
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关键词
Metronidazole,Cu−S−Cu bridges,π(CN)···tetrel interaction,thermal properties
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