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Spectroscopic studies of the boron trihalide and borane complexes of 1,4-diazabicyclo[2.2.2]octane and quinuclidine

1974; Pergamon Press; Volume: 30; Issue: 4 Linguagem: Inglês

10.1016/0584-8539(74)80019-x

1873-3824

James R. McDivitt, George L. Humphrey,

Mass Spectrometry Techniques and Applications

An i.r. and Raman study is presented of 1,4-diazabicyclo[2.2.2]octane (Dabco) and complexes formed by reaction of Dabco with boron trihalides and borane. The two nitrogen atoms in the Dabco molecule each react with a boron trihalide, or borane molecule, to form a Dabco (BX3)2 complex, where X = F, Cl, B, I and H. The boron-10 isotopically enriched boron trihalide complexes with Dabco were also investigated. Infrared and Raman spectra of quinuclidine (Abco) complexes with boron trihalides and borane were investigated as an aid in the spectral interpretation of the Dabco complexes. Vibrational assignments for the Dabco complexes were made for the absorptions occurring below 1500 cm−1. It is concluded that a molecular symmetry of D3h allows a more consistent assignment of fundamental modes of vibration for the Dabco complexes than does D3 symmetry. Assignments for fundamental modes of vibration below 1000 cm−1 for quinuclidine and the quinuclidine complexes were made on the basis of C3v symmetry.