A study of the ir spectra of the copigments of malvin chloride with organic acids | Zendy

Jasmina M. Dimitrić-Marković | Zendy; U.B. Mioč | Zendy; Jelisavetam Baranac | Zendy; Zoran Nedić | Zendy

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A study of the ir spectra of the copigments of malvin chloride with organic acids

Author(s) -

Jasmina M. Dimitrić-Marković,

U.B. Mioč,

Jelisavetam Baranac,

Zoran Nedić

Publication year - 2001

Publication title -

journal of the serbian chemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.227

H-Index - 45

eISSN - 1820-7421

pISSN - 0352-5139

DOI - 10.2298/jsc0107451d

Subject(s) - hydrogen bond , chemistry , molecule , infrared spectroscopy , oxonium ion , infrared , crystallography , inorganic chemistry , ion , photochemistry , organic chemistry , physics , optics

The infrared spectra of the copigments of malvin with several organic acids: caffeic, ferulic, sinapic, chlorogenic, and tannic, were analyzed in order to elucidate the bonding of the molecules in the copigments. It was established that copigmentation is realized through hydrogen bonding between malvin molecules and the acids under study. The infrared spectra reveal that two groups of hydrogen bonds are formed, which include interactions of different molecular structures: hydroxy groups (bands around 3500 cm–1) and oxonium ions of the molecules (bands below 3000 cm–1). The formed hydrogen bonds were found to be of different strengths. The strengths of the hydrogen bonds were tentatively correlated with thermodynamic properties of the corresponding copigmentation reactions.

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