EN
This review covers investigations of spiropyran
iodides with N-substituted indoline fragment, and with
the pyran cycle being annelated to N-methylated pyridine
ring. The schemes of synthesis of iodides and their neutral
precursors, as well as results of X-ray analysis and photochemical
study of the crystals of the obtained compounds
are presented. Based on our and literature data, the relationship
between the structure and photochromic properties
has been discussed for a series of salts and neutral
pyridospiropyrans.