Synthesis, Characterizations, Crystal Structure, DFT, and Hirshfeld Surface Analysis of 4-Cyclohexyl-1-(thiophene-2-carbonyl)thiosemicarbazide
作者:Shivendra Kumar Pandey、Seema Gupta、Shubham Jaiswal、M. K. Gond、M. K. Bharty、R. J. Butcher
DOI:10.1007/s10870-022-00965-x
日期:——
The crystal structure of the thiosemicarbazide derivative 4-cyclohexyl-1-(thiophene-2-carbonyl)thiosemicarbazide (ChtcTSC), C12H17N3OS2, is reported here. The title compound ChtcTSC has been characterized by various physicochemical techniques viz UV–Vis., Infrared, and NMR. It crystallizes in the monoclinic system having space group P21/c. The dihedral angle between the thiophene and cyclohexyl rings is 60.7(4)°. The crystal packing is established by intermolecular N–H⋯O packing interactions involving a three-center donor hydrogen bond between the keto oxygen atom of the thiophene group and H atoms belonging to the hydrazine group which links the molecules into chains along the (011) plane of the unit cell. Hydrogen bonds between the hydrazine hydrogen atom and one of the thiophene groups and C–H⋯Cg π -ring interactions provide added stability to the crystal packing. The fingerprint plots associated with Hirshfeld surface analysis indicate that there are different types of weak interactions viz. O⋯H–C, O⋯H–N, and S⋯H–C. The geometry optimization has been performed using the DFT method, and geometrical parameters thus obtained for ChtcTSC correlate with the single-crystal X-ray data. The TD-DFT study showed a small HOMO and LUMO energy gap of 2.869 eV. The electronic transition from the ground state to the excited state due to a transfer of electrons from HOMO to LUMO levels is mainly associated with the n → π* transition. The crystal structure of 4-cyclohexyl-1-(thiophene-2-carbonyl)thiosemicarbazide (ChtcTSC) is reported here where the title compound ChtcTSC has been characterized by various physiochemical techniques including UV–Vis., Infrared, NMR, DFT and Hirshfeld surface analysis.
本文报告了硫代氨基脲衍生物 4-环己基-1-(噻吩-2-羰基)硫代氨基脲(ChtcTSC)(C12H17N3OS2)的晶体结构。标题化合物 ChtcTSC 已通过紫外可见光、红外线和核磁共振等各种理化技术进行了表征。它在单斜体系中结晶,空间群为 P21/c。噻吩环和环己基环之间的二面角为 60.7(4)°。晶体的堆积是由分子间的 N-H⋯O 堆积相互作用形成的,其中涉及噻吩基团的酮氧原子和属于肼基团的 H 原子之间的三中心供体氢键,该氢键将分子沿单胞的 (011) 平面连接成链。肼氢原子和其中一个噻吩基团之间的氢键以及 C-H⋯Cg π - 环相互作用增加了晶体堆积的稳定性。与 Hirshfeld 表面分析相关的指纹图表明,存在不同类型的弱相互作用,即 O⋯H-C、O⋯H-N 和 S⋯H-C。使用 DFT 方法对 ChtcTSC 进行了几何优化,由此获得的几何参数与单晶 X 射线数据相关。TD-DFT 研究表明,该化合物的 HOMO 和 LUMO 能隙较小,分别为 2.869 eV 。由于电子从 HOMO 水平转移到 LUMO 水平,从基态到激发态的电子转变主要与 n → π* 转变有关。本文报告了 4-环己基-1-(噻吩-2-羰基)硫代氨基甲酰肼(ChtcTSC)的晶体结构,并通过紫外可见光、红外、核磁共振、DFT 和 Hirshfeld 表面分析等多种理化技术对标题化合物 ChtcTSC 进行了表征。