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

Autor:	M Jasmina Dimitric-Markovic, B Ubavka Mioc, Jelisavetam Baranac, P Zoran Nedic
Jazyk:	angličtina
Rok vydání:	2001
Předmět:	copigmentation Infrared spectroscopy General Chemistry Chloride malvin lcsh:Chemistry chemistry.chemical_compound chemistry lcsh:QD1-999 organic acids medicine ir spectra Malvin Nuclear chemistry medicine.drug
Zdroj:	Journal of the Serbian Chemical Society, Vol 66, Iss 7, Pp 451-462 (2001)
ISSN:	1820-7421 0352-5139
Popis:	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.
Databáze:	OpenAIRE
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