Abstract The microwave spectrum of dioxadiazathiapentalene has been analysed in the ground state and in a few vibrationally excited states. The ground-state rotational constants (in MHz) were found to be A = 4452.8265(12); B = 1697.56541(45); C = 1229.04579(48). The spectrum is perfectly normal of a rigid, C2v, asymmetric rotor, as was the case with 1,6-dioxa-6aλ4-thiapentalene. It is therefore concluded
摘要 对二恶二氮杂硫戊烯在基态和几个振动激发态的微波光谱进行了分析。发现基态旋转常数(以 MHz 为单位)为 A = 4452.8265(12);B = 1697.56541(45);C = 1229.04579(48)。光谱完全符合刚性、C2v、不对称转子的正常情况,如 1,6-二氧杂环己烷-6aλ4-硫戊烯的情况。因此得出结论,没有双极小电子基态的证据。电偶极矩为 |μb| = 2.883(20) D.