Dimerization, J-aggregation and J-disaggregation dynamics of indocyanine green in heavy water

✍ Scribed by M. Mauerer; A. Penzkofer; J. Zweck

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 755 KB
• Volume: 47
• Category: Article
• ISSN: 1011-1344
• DOI: 10.1016/s1011-1344(98)00205-x

✦ Synopsis

The dimerization constant of freshly prepared samples of indocyanine green sodium iodide in D20 is determined by an analysis of the concentration-dependent absorption behaviour. At high concentrations J-aggregates are formed in due time by heat treatment. The activation energy of molecule attachment to J-aggregates is determined by analysing the temperature dependence of the rate of J-aggregate growth. The activation energy of molecule detachment from J-aggregates is deduced from measurements of the temperature-dependent rate of J-aggregate absorption decrease after strong dilution. Compared to indocyanine green sodium iodide in water, the dimerization constant is reduced, and the rates of J-aggregate formation at high concentration and of molecule detachment from J-aggregates at low concentration are slowed down.