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Raman spectroscopic investigation of N ‐alkylurotropinium polyiodides
Author(s) -
Mittag H.,
Stegemann H.,
Füllbier H.,
Irmer G.
Publication year - 1989
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250200409
Subject(s) - raman spectroscopy , triiodide , chemistry , ion , wavenumber , spectral line , analytical chemistry (journal) , alkyl , crystallography , organic chemistry , physics , optics , astronomy , dye sensitized solar cell , electrolyte , electrode
N ‐Alkylurotropinium polyiodides, UrRI x , with different iodine contents and different sizes of alkyl group were investigated by Raman spectroscopy. The spectra were recorded for wavenumber shifts up to 500 cm −1 . It was found that the triiodides, UrRI 3 , contain a symmetrical linear I 3 − ion. The pentaiodides, UrRI 5 , contain no triiodide unit; the anion structure can be described as nearly symmetrical, rectangular L‐shaped I 5 − . An interpretation of the Raman spectra of the heptaiodides, UrRI 7 , is that the anion corresponds to an I 5 − . I 2 structure. This is the first proof of such a heptaiodide. A review of previously published data on the Raman spectra of polyiodides is also given.