Am. Brouwer et al., THROUGH-BOND INTERACTION IN THE RADICAL-CATION OF N,N-DIMETHYLPIPERAZINE - RESONANCE RAMAN-SPECTROSCOPY AND QUANTUM-CHEMICAL CALCULATIONS, Chemical physics letters, 225(4-6), 1994, pp. 386-390
The radical cation of N,N-dimethylpiperazine is investigated by resona
nce Raman spectroscopy and ab initio calculations. The calculations st
rongly support the assignment of the vibrational spectrum to a chair c
onformation. It is shown that a dramatic geometry relaxation following
ionization allows a much more efficient interaction between the nitro
gen 'lone pairs' than in the neutral ground state.