Synthesis and Photo- and Ionochromic and Spectral-Luminescent Properties of 5-Phenylpyrazolidin-3-one Azomethine Imines

Table 1

Electronic absorption and fluorescence spectra of isomeric forms of 1–4 in acetonitrile.

Comp.	Ring-opened form O			Ring-closed form C
	Absorption		Fluorescence, , nm (, a.u.)	Absorption, , nm
	, nm	, L mol^−1 cm^−1
1	346, 360	2.9, 3.1	—	241	0.21
2	339, 351	2.6, 2.5	—	261	0.12
3	348, 364, 380	3.8, 4.7, 4.0	411 (209)	275, 318	0.10, 0.07
4	321, 378	1.5, 3.0	514 (430)	249	0.88

and : maxima of absorption and fluorescence bands, respectively; : fluorescence intensity; : optical density at the maximum of absorption band of form C after irradiation with light of 365 nm for 2 min.