cyanine dye cation to a borate anion. The ΔGel values were estimated for photoredox pairs containing a series of phenyltrialkylborate anions and one selenocarbocyanine dye cation. The relationship between the rate of polymerization and the free energy of activation for electron transfer reaction gives the dependence predicted by the classical theory of electron transfer. The photoreduction of cyanine
Polymethinfarbstoffe durch Ringspaltung des s-Triazins
作者:A. Kreutzberger
DOI:10.1002/ardp.19662991102
日期:——
dabei entstehenden Bruchstücke können gleichzeitig zum Ausgangspunkt neuer Synthesen werden. Die Einwirkung von quartären Methyl‐heterocyclen als nucleophile Reaktionskomponente auf s‐Triazin führt zu Polymethinfarbstoffen. Die neuartige Synthese dieser Farbstoffklasse ist mit aktiven Methylverbindungen aus dem Gebiete der Indole (X), Oxazole (XIX), Benzoxazole (XII), Benzthiazole (XIII, XXII) und Benzselenazole
Synthesis of cyanine dyes derived from benzotellurazo-15-crown-5
作者:Weijun Ke、Xuehong Luo、Xiufang Liu、Hansheng Xu
DOI:10.1002/jhet.5570370550
日期:2000.9
A series of crown ether cyaninedyes including crown ether styryl cyaninedyes, crown ether merocyanine dyes and crown ether squarylium cyaninedyes (unsymmetric and symmetric) derived from key intermediate 2-methyl-5,6(15-crown-5)benzotellurazole (1) were prepared.
Novel heterocyclic dyes as DNA markers. Part I. Synthesis and characterization
作者:Wenceslao Moreda、Alexander R Forrester
DOI:10.1016/s0040-4020(97)00528-0
日期:1997.9
A range of new cyanine dyes has been prepared and characterised. These dyes are more conveniently synthesised by the reaction of two heterocyclic quaternary salts. The dyes contain a purine heterocycle coupled to an aro-(thia-, selena-, oxa-, imida)zole and are in the form of iodide or p-toluenesulphonate salts. Characterisation were done by FABMS and NMR spectroscopy. These dyes can be used as fluorescent
function in the oxazole dyes 3a and 3e. 1H and 1H DOSY solution NMRspectroscopy prove that slight structural changes result in significant differences in the process of self-association. The association constants for dimerization have been determined by curve fitting the concentration dependent 1HNMR spectra based on the isodesmic model. Van’t Hoff analysis has been used to determine the thermodynamic parameters