| Abstract: | The microwave spectrum of isopropyl fluoroformate is characterized by intense a-type R-branch transitions from one conformational species. The rotational constants of the ground state, A0 = 4967.0(8) MHz, B0 = 1704.69(2) MHz, C0 = 1468.86(1) MHz and κ = ?0.8651(2) are consistent with a τ1 (O=COC) = 0°, τ2(COCH) ?35° structure. This structure can be viewed as a combination of the two conformational species found in ethyl fluoroformate. Two vibrational satellites having rotational constants A0 = 4963(5) MHz, B0 = 1694.11(7) MHz. C0 = 1471.43(4) MHz and A0=4998(6) MHz, B0 = 1705.21(7) MHz, C0 = 1471.10(4) MHz have been assigned. |
