{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,19]],"date-time":"2026-08-19T17:49:56Z","timestamp":1787161796721,"version":"build-2736575974"},"reference-count":75,"publisher":"AIP Publishing","issue":"7","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2007,2,21]]},"abstract":"<jats:p>The Raman spectra of a series of push-pull molecules containing probenzenoid or quinoid spacers which are substituted with 1,3-dithiol-2-ylidene as donor and dicyano-methylene or barbituric acid as acceptors have been analyzed. The experimental spectra have been assigned and interpreted according to density functional theory calculations. Correlations between the Raman spectra of the isolated spacers and of the substituted molecules have been done. Raman bands in the 1620\u20131560cm\u22121 interval provide vibrational markers of the quinoid\u2194aromatic structural evolution. This finding is supported by a careful inspection of geometrical parameters, namely, bond length alteration data and particular bond distances. As a result, the peak positions and relative intensities of these Raman features can be used to evaluate the benzenoid character of the spacer as a function of the donor\/acceptor substitution pattern. This paper shows that Raman spectroscopy is a powerful spectroscopic tool for the analysis of the conjugational properties (i.e., intramolecular donor\u2192acceptor charge transfer) of new organic materials.<\/jats:p>","DOI":"10.1063\/1.2395936","type":"journal-article","created":{"date-parts":[[2007,2,15]],"date-time":"2007-02-15T18:15:56Z","timestamp":1171563356000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":7,"title":["Vibrational fingerprint of the structural tuning in push-pull organic chromophores with quinoid or proaromatic spacers"],"prefix":"10.1063","volume":"126","author":[{"given":"Juan","family":"Casado","sequence":"first","affiliation":[{"name":"University of M\u00e1laga Department of Physical Chemistry, , Campus de Teatinos s\/n, M\u00e1laga 29071, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mar\u00eda","family":"Moreno Oliva","sequence":"additional","affiliation":[{"name":"University of M\u00e1laga Department of Physical Chemistry, , Campus de Teatinos s\/n, M\u00e1laga 29071, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M. 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