Microwave spectrum, average structure and dipole moment of 1-chloropropyne, CH3C ? CCl
作者:A. Peter Cox、Mark C. Ellis、Teresa Perrett
DOI:10.1039/ft9928802611
日期:——
The microwave spectrum of 1-chloropropyne, CH3C CCl, has been reinvestigated in the frequency range 8–41 GHz. Previous ambiguities in the ground-state centrifugal distortion constants have been removed. Microwave data for ten isotopomers have been used to calculate the zero-point average structure after the necessary vibrational corrections:r(CC)= 1.201(2)Å, r(C—C)= 1.461(1)Å, r(C—Cl)= 1.643(2)Å,
∠HCH = 108.4(2)°, r(C—H)= 1.103(5)ÅThe ground-state dipole moment has been determined to be 1.409(3) D (1D ≈ 3.335 64 × 10–30C m) from Stark-effect measurements. The vibrational satellite series from the lowest degenerate bending mode ν10 has been assigned. For V10= 1/-type doubling has been measured, giving q10= 2.029 (5) MHz which gives the wavenumber of ν10 to be 184(8) cm–1.
1-氯丙炔(CH3C CCl)的微波频谱已在 8–41 GHz 频率范围内进行了重新研究。先前的基态离心畸变常数的模糊性已被消除。十种同位素异构体的微波数据已用于计算必要的振动校正后的零点平均结构:r(CC)= 1.201(2)Å, r(CC)= 1.461(1)Å, r(C— Cl)= 1.643(2)Å,
∠HCH = 108.4(2)°, r(C—H)= 1.103(5)Å 根据 Stark- 计算,基态偶极矩为 1.409(3) D (1D ≈ 3.335 64 × 10–30C m)效应测量。最低简并弯曲模式 ν10 的振动卫星系列已被指定。对于 V10= 1/-型倍频,已测量出 q10= 2.029 (5) MHz,这使得 ν10 的波数为 184(8) cm–1。