Abstract
Quantum chemical calculations and a comparative analysis of Raman spectra of 3,4,5-triphenyl-1-propyl-1,2-diphosphole (1), anti-endo-4,7,8,9-tetraphenyl-10-propyl-4-aza-1,10-diphosphatricyclo[5.2.1.02,6]deca-8-ene-3,5-dione (2) and 1,2,6,7-tetraphospha-3,4,5,8,9,10-hexaphenyltricyclo[5.3.0.02,6]deca-3,9-diene (3) made it possible to explain considerable differences in the UV absorption spectra of these compounds. The phenyl groups in the compounds under study, despite the steric factor, are conjugated with the π-system of the heterocycle, which in the case of diphosphole 1 comprises π-electrons of the C=C and P=C bonds. The disturbance of this diene system in molecules 2 and 3 decreases the effective length of conjugation of phenyl groups with the attached double bonds of the phosphorus-containing ring, that results in the hypsochromic shift of the π—π* electron transition bands in the UV absorption spectrum from 411 to 312 nm. The formation in molecule 3 of the four-membered ring P4, which is a new chromophore group, leads to the appearance of an additional absorption band with the maximum at ∼342 nm.
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Based on the materials of the XXVI International Chugaev Conference on Coordination Chemistry (October 6—10, 2014, Kazan).
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1896—1900, August, 2015.
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Burganov, T.I., Katsyuba, S.A., Zagidullin, A.A. et al. Conjugation effects and optical spectra of 1,2-diphosphole cycloadducts. Russ Chem Bull 64, 1896–1900 (2015). https://doi.org/10.1007/s11172-015-1090-4
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DOI: https://doi.org/10.1007/s11172-015-1090-4