Structure and photochromic properties of a single-crystalline spiro[indolinepyranopyridinium] salt |
| |
Authors: | S M Aldoshin L A Nikonova V A Smirnov G V Shilov N K Nagaeva |
| |
Institution: | (1) Institute of Problems of Chemical Physics, Russian Academy of Sciences, 1 prosp. Akad. Semenova, 142432 Chernogolovka, Moscow Region, Russian Federation |
| |
Abstract: | The molecular and crystal structure of single crystalline 5’-hydroxymethyl-1,3,3,7’, 8’-pentamethylspiroindoline-2,2’-2H]-pyrano3,4-b]pyridinium] iodide (1) was studied. The crystal structure is composed of cation layers separated by iodide ions and provides a sufficient volume
for the phototransformation of compound 1. The spectroscopic and photochromic properties of this compound in the crystalline state were investigated. Upon irradiation
with light at 270–370 nm, up to 600 layers of single crystals are subjected to photochromic transformations. The quantum yield
of formation of the open form is ∼0.1, and the quantum yield of decoloration is 0.04. After ten reversible photocyclizations,
the absorption of the colored form was decreased by 10%. The photochromic properties were related to the single-crystal structure.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 2050–2055, September, 2005. |
| |
Keywords: | spiropyran salt spiro[indolinepyranopyridinium] iodide single crystal photochromic properties |
本文献已被 SpringerLink 等数据库收录! |
|