Comparative Analysis of Physicochemical Properties of
Dinuclear Zinc(II) Helicates with 2,2'-, 2,3'-, and 3,3'-
Bis(dipyrromethenes)

E. V. Antina^a, L. A. Antina^a, G. B. Guseva^a, M. B. Berezin^a,
A. I. V’yugin^a, A. S. Semeikin^b, and A. A. Ksenofontov^b

^a Krestov Institute of Solution Chemistry, Russian Academy of Sciences, Akademicheskaya 1, Ivanovo, 153045 Russia

^b Ivanovo State University of Chemistry and Technology, pr. Fridrikha Engel’sa 7, Ivanovo, 153000

e-mail: eva@isc-ras.ru

Received October 21, 2013

Abstract—The effect of the attachment position of a methylene spacer in 2,2'-, 2,3'-, and 3,3'-bis(dipyr-
romethene) N₄-ligands (H₂L) on physicochemical properties of their dinuclear homoleptic helicates [Zn₂L₂],
such as specific features of their molecular structure, luminescence spectral characteristics, lability in acid solu-
tions, and thermal stability in an argon atmosphere, has been examined. It has been shown that the substitution
of the biladiene-type helicand by its 2,3- and especially 3,3'-analogues leads to a considerable enhancement of
the chromophoric properties, an increase (up to 30-fold) of the fluorescence quantum yield, and an increase in
the stability of corresponding dinuclear helicates [Zn₂L₂].

DOI: 10.1134/S0036023614060023

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