从乙醚和二硫化碳溶液中生长的DPPH单晶.晶体结构、IR、EPR和磁化研究
Single crystals of DPPH grown from diethyl ether and carbon disulfide solutions - Crystal structures, IR, EPR and magnetization studies
摘要：
以乙醚和二硫化碳为原料合成了自由基2，2-二苯基-1-苦基肼（DPPH），用X射线衍射、红外光谱、电子顺磁共振（EPR）和超导量子干涉仪（SQUID）等方法对DPPH单晶进行了表征。X-射线结构分析和红外光谱表明，从醚中结晶的DPPH形式（DPPH 1）是无溶剂的，而从CS2中获得的DPPH形式（DPPH 2）是组成4DPPH·CS2的溶剂化物。在室温和低温（10 K）下的X-波段EPR谱估计的g-张量的主值。磁化研究表明，存在反铁磁耦合二聚体在这两种类型的晶体。但两种DPPH的二聚化方式和交换耦合强度不同，这与它们的晶体结构相一致。所得结果提高了参数的准确性，并使更好地了解DPPH作为EPR谱中的标准样品的性质。
英文摘要：
Single crystals of the free radical 2,2-diphenyl-1-picrylhydrazyl (DPPH) obtained from diethyl ether (ether) and carbon disulfide (CS2) were characterized by the X-ray diffraction, IR, EPR and SQUID magnetization techniques. The X-ray structural analysis and IR spectra showed that the DPPH form crystallized from ether (DPPH1) is solvent free, whereas that one obtained from CS2 (DPPH2) is a solvate of the composition 4DPPH.CS2. Principal values of the g-tensor were estimated by the X-band EPR spectroscopy at room and low (10 K) temperatures. Magnetization studies revealed the presence of antiferromagnetically coupled dimers in both types of crystals. However, the way of dimerization as well as the strength of exchange couplings are different in the two DPPH samples, which is in accord with their crystal structures. The obtained results improved parameters accuracy and enabled better understanding of properties of DPPH as a standard sample in the EPR spectrometry.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
