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Spiropyrans: Synthesis, Properties, and Application. (Review)

“…The spiropyran 76 containing two different spirocyclic centers and, accordingly, two different hetarene fragments in the molecule was synthesized on the basis of the obtained spiropyran 75, which is a unique analog of salicylaldehyde [99]. …”

“…Complexes of bisspiropyrans are known, and their complexing ability has been studied in comparison with monospiropyran [99,117,118]. It was found that the complexes of bisspiropyrans have higher photochemical activity than those of monospiropyrans.…”

“…According to X-ray crystallographic analysis, crystal solvates of the target compounds can be formed, depending on the solvent used for recrystallization of the hydrazones containing the spiro carbon atom [128]. The hydrazones 93, used as ligands for the synthesis of binuclear complexes of copper 94 and 95 [130], were obtained on the basis of the spiropyran 75, which contains ortho-located hydroxy and formyl groups in the benzene ring of the [2H]chromene fragment [99]. …”

“…The recently obtained [99] spiropyran of the indoline series containing ortho-located formyl and hydroxy groups in the benzene ring of the [2H]chromene fragment exhibits photochromic characteristics in the adsorbed state and contains centers capable of chelation with a metal. The length of the hydrogen bond, determined from X-ray crystallographic analysis, amounts to 1.978 Å [150].…”