Microwave Spectrum and Molecular Structure of Formamide

摘要: The microwave spectra of ten isotopic species formamide (H2N–CHO) have been investigated. Type a and type b transitions identified measured for all species. inertial defect is found to decrease whenever heavier isotope substituted any atom in the NH2 group, fact negative four studied. It concluded that molecule nonplanar with H2N–C group forming shallow pyramid. structural parameters deduced from rotational constants are: r(N–H′, where H′ trans aldehyde hydrogen) = 1.014±0.005 A, r(N–H″, H″ cis 1.002±0.005 r(N–C) 1.376±0.010 r(C–H) 1.102±0.010 r(C=O) 1.193±0.020 ∠H′NH″ 118°53′ ±40′, ∠H″NC 120°37′±40′, ∠H′NC 117°9′±40′, ∠NCO 123°48′±40′, ∠NCH 113°14′±40′ ∠OCH 122°58′±40′. dihedral angles between H′NC plane NCO plane, H″NC NCH are 7°±5°, 12°±5°, respectively.In investiga...