and Raman), UV-Vis and multinuclear NMR spectroscopy techniques and by mass spectrometry. The conformational preference and its crystal structure have been determined by means of FTIR spectroscopy (gas phase and Ar-matrix) and by X-ray diffraction. A charge density determination of X-ray diffraction (XRD) data of single crystals formed by in situ crystallization reveals the presence of solely a synperiplanar
通过在真空条件下CF 3 C(O)Cl和(CH 3)3 CSH的缩合制备CF 3 C(O)SC(CH 3)3的S-(叔丁基)
三氟硫代乙酸酯。通过使用振动(红外和拉曼光谱仪),UV-Vis和多核NMR光谱技术以及质谱法对化合物进行了分离和适当表征。构象偏好及其晶体结构已经通过FTIR光谱法(气相和Ar基质)和通过X射线衍射确定。原位形成单晶的X射线衍射(XRD)数据的电荷密度测定结晶揭示了仅存在一个对称平面点构象(C O双键相对于SC单键的顺式取向)属于C s点对称组。在晶体中检测到了分子间的C O⋯C O和C O⋯H–C相互作用。在B3LYP / cc-pVTZ近似
水平下的量子
化学计算可以很好地再现构象偏好和实验几何参数。振动信息是从Ar矩阵隔离FTIR和液体拉曼光谱中获得的。另外,CF 3 C(O)SC(CH 3)3在约70 ℃下在固体Ar中分离。用紫外可见宽带光(200≤λ≤800 nm)照射15