✦ LIBER ✦
Chiral stacking of cyanin and pelargonin --- soluble and insoluble aggregates as determined by means of circular dichroism
✍ Scribed by Toshio Goto; Hirotoshi Tamura; Tadao Kondo
- Book ID
- 104233490
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- French
- Weight
- 148 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0040-4039
No coin nor oath required. For personal study only.
✦ Synopsis
CD of anthocyanidin 3,5_diglucosides show a negative exciton-type Cotton curve (A = -4d-18) when dissolved in neutral aqueous solution. Pelargonin and cyanin show an unusual aging effect; insoluble particles of the anhydrobase gradually form to give a suspension, which shows a positive and unsymmetrical exciton-type CD curve (pelargonin: A = ca t45). Trace amounts of aluminum ions, if present in the buffer solution used, form aluminum chelate of cyanin, which gives a large positive exciton-type Cotton effect (A = ca tllo).