The title compound, 5-hydroxy-5,6-di-pyridin-2-yl-4,5-dihidro-2H-[1,2,4]triazine-3-thione (C13H11 N5OS), was prepared and characterized by electronic spectroscopy and single-crystal X-ray diffraction (XRD). The compound crystallizes in the triclinic space group P-1 with a = 8.5808(8) angstrom, b = 8.7032(7) angstrom, c = 10.0505(9) angstrom, alpha = 84.194( 7)degrees, beta = 75.181(7)degrees and gamma = 63.562(6)degrees. In addition to the molecular geometry, vibrational frequencies and gauge including atomic orbital (GIAO) H-1 and C-13 NMR chemical shift values of the title compound in the ground state have been calculated using the Hartree-Fock (HF) and density functional theory (OFT) methods with 6-31G(d) basis sets. To determine conformational flexibility, the molecular energy profile of the title compound was obtained by semi-empirical (AM1) calculations with respect to the selected torsion angle, which was varied from -180 degrees to + 180 degrees in steps of 10 degrees. The energetic behavior of the title compound in solvent media was examined using the B3LYP method with the 6-31G(d) basis set by applying the Onsager and the Polarizable Continuum Model (PCM). By using TD-DFT method, electronic absorption spectra of the title compound have been predicted and a good agreement with the TO-OFF method and the experimental one is determined. The predicted nonlinear optical properties of the title compound are much greater than ones of urea. In addition, the molecular electrostatic potential (MEP), frontier molecular orbitals (FMO) analysis and thermodynamic properties of the title compound were investigated using theoretical calculations. Published by Elsevier B.V.
New Route to Synthesis of Unexpected Pyridoin Derivatives: Their Structure Determination with Spectroscopic and X-Ray Methods
作者:Alaaddin Cukurovali
DOI:10.1080/00397910902906537
日期:2009.11.18
new 1,2,4-triazine-3-thione derivatives were obtained by a new route using a one-step process. The structure of the compounds was determined with infrared (IR), 1H NMR, and 13C NMR spectroscopic methods and elemental analysis. A representative x-ray crystallographic analysis of 3 was given, and its x-ray data are discussed in detail. This is a facile procedure and shorter than earlier methods.
摘要 新的1,2,4-三嗪-3-硫酮衍生物通过一条新的路线一步法获得。化合物的结构通过红外(IR)、1H NMR和13C NMR光谱方法和元素分析确定。给出了 3 的代表性 X 射线晶体学分析,并详细讨论了其 X 射线数据。这是一个简单的过程并且比早期的方法更短。