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

被引:2
|
作者
Ajibola, Abiodun A. [1 ]
Cubillan, Nestor [2 ]
Wojciechowska, Agnieszka [3 ]
Sieron, Leslaw [4 ]
Maniukiewicz, Waldemar [4 ]
机构
[1] Thomas Adewumi Univ, Dept Chem Sci, PMB 1050, Oko Irese, Kwara State, Nigeria
[2] Univ Atlantico, Fac Ciencias Basicas, Programa Quim, Barranquilla, Colombia
[3] Wroclaw Univ Sci & Technol, Fac Chem, Wyb Wyspianskiego 27, PL-50370 Wroclaw, Poland
[4] Lodz Univ Technol, Inst Gen & Ecol Chem, Zeromskiego 116, PL-90924 Lodz, Poland
关键词
Metronidazole; Cu-S-Cu bridges; pi (CN) & sdot; & sdot; tetrel interaction; Thermal properties; PSEUDOPOTENTIALS; BONDS; BR;
D O I
10.1016/j.molstruc.2024.138839
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Within 24 h of slow evaporation of the solution containing CuCl2 & sdot;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 staircaselike [CuSCN]n chains. Intermolecular interactions in the crystals investigation via Hirshfeld surface analysis reveals the major contribution is from O & sdot;& sdot;& sdot;H/H & sdot;& sdot;& sdot;O interaction (22.9 %), which is due to the presence of hydrogen bonds of the O - H & sdot;& sdot;& sdot;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 pi-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 pi & sdot;& sdot;& sdot;pi interaction between SCN- and the imidazole ring of mnz. In this interaction, the pi(SN) and pi(CN) orbitals perturb the imidazole pi(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 pi(CN)& sdot;& sdot;& sdot;tetrel interaction, wherein SCN- donates pi-electron density to the antibonding sigma(CH) orbital of the methyl carbon.
引用
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页数:11
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