Supramolecular architecture formed between amidinothiourea and 2-pyridinecarboxylic acid

被引:4
|
作者
Janczak, Jan [1 ]
机构
[1] Polish Acad Sci, Inst Low Temp & Struct Res, Okolna 2, PL-50422 Wroclaw, Poland
关键词
1-(diaminomethylene)thiouron-1-ium 2-pyridinecarboxylate; Crystal structure; Hirshfeld surface; DFT calculations; Vibrational spectroscopy; MOLECULAR-ORBITAL METHODS; HYDROGEN-BONDED NETWORKS; GAUSSIAN-TYPE BASIS; PI-PI STACKING; INTERMOLECULAR INTERACTIONS; SPECTROSCOPIC CHARACTERIZATION; PHARMACEUTICAL COCRYSTALS; STRETCHING VIBRATIONS; STATE STRUCTURE; TRIMESIC ACID;
D O I
10.1016/j.molstruc.2021.130736
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
The single crystals of 1-(diaminomethylene)thiouron-l-ium 2-pyridinecarboxylate, (C2H7N4S)-(C5NH4COO), (1) suitable for the X-ray analysis were grown using a solution growth technique room temperature. Recrystallization of 1 in heavy water (three-times) yield respective deuterated analogue, (C2H7N4S)-(C5NH4COO), (1d). The X-ray analyses show that both, protonated and deuterated, compounds crystallize in the same crystal system with quite similar lattice parameters. X-ray analysis on a single crystal of 1 measured at 100 K and RT showed that no structural phase changes were observed between RT and 100 K. At both temperatures, crystal 1 belongs to the centrosymmetric space group of the triclinic system with two molecules in an asymmetric unit. In both molecules of the asymmetric unit the opposite charged units interact each other via the same R-2(2)(8) hydrogen bonding graph that is formed by donation of the amine groups linked to the same carbon atom to both oxygen atoms of the COO of the 2-pyridinecarboxylate anions. The 1-(diaminomethylene)thiouron-l-ium 2-pyridinecarboxylate units are interact each other via additional N-H center dot center dot center dot O and N-H center dot center dot center dot N hydrogen bonds formed between these independent hydrogen bonded R-2(2)(8) units forming layers parallel to (001) crystallographic plane. The interactions between layers is significantly weaker than within the layers since the layers interact via much weaker N-H center dot center dot center dot S hydrogen bonds. Thus the (001) crystallographic plane is a cleave plane of the crystals 1. Hirshfeld surface and the analysis of 2D fingerprint plots are illustrating both quantitatively and qualitatively interactions governing the supramolecular assemblies. The compound was also characterised by the FT-IR and Raman spectroscopy. Assignment of the vibrational bands have been supported by the DFT calculations and the isotropic frequency shift. (C) 2021 Elsevier B.V. All rights reserved.
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页数:12
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