Scheme 1. Formation of merocyanine dipoles upon irradiation
In his 1978 paper Krongauz coined the term “Quasi-Crystals” for the new self-organized colloidal particles . The Quasi-crystals are supramolecular aggregates manifesting both crystalline properties e.g. Bragg scattering, as well as amorphous, liquid-like properties i.e. drop-like shapes, fluidity, extensibility and elasticity in electric field. The supramolecular Quasi-crystals are produced in photochemical reaction by exposing solutions of photochromic spiropyran molecules to UV radiation. The ultraviolet light induces the conversion of the spiropyrans to merocyanine molecules that manifest electric dipole moments. (see Scheme 1). The quasi-crystals have external shape of submicron globules and their internal structure consists of crystals enveloped by an amorphous matter (see Fig. 1). The crystals are formed by self-assembled stacks of the merocyanine molecular dipoles aligning themselves in a parallel manner, while amorphous envelopes consist of the same merocyanine dipoles aligned in an anti-parallel manner (Fig. 1, Scheme 2).[2][3][4] In an applied electrostatic field, quasi-crystals form macroscopic threads that show linear optical dichroism.[1][5]
Later Krongauz described unusual phase transitions of molecules composed of mesogenic and spiropyran moieties, which he named "quasi-liquid crystals." A micrograph of their mesophase appeared on the cover of Nature in a 1984 paper, “Quasi-Liquid Crystals.”[6] The investigation of spiropyran-merocyanine self-organized systems, including macromolecules (see, for example, Fig. 2), has continued over the years.[7][8][9][10][11]
Figure 2. Illustration of Self-Assembling Spiropyran Polymers by Zipper Crystallization[7]
These studies have resulted in discoveries of unusual and practically significant phenomena. Thus, in the electrostatic field, quasi-crystals and quasi-liquid crystals have exhibited 2nd order non-linear optical properties.[12][13][14]
Potential applications of these fascinating materials have been described and patented.[15][16][17]
Work on spiropyran-merocyanine self-assemblies currently continues in several laboratories.[18]
^V. A. Krongauz; S. N. Fishman; E. S. Goldburt (1978). "Quasi-crystals. Growth from photochromic spiropyrans on irradiation in a constant electric field". J. Phys. Chem. 82 (23): 2469–74. doi:10.1021/j100512a004.
^V. A. Krongauz (1979). "Quasi-Crystals". Israel Journal of Chemistry. 18 (3–4): 304–11. doi:10.1002/ijch.197900047.
^V. A. Krongauz (1979). "Quasi-Crystals Produced by Colloidal Photochromic Dyes in an Applied Electric Field". In B. R. Jennings (ed.). Electro-Optics and Dielectrics of Macromolecules and Colloids. Springer US. pp. 329–36. doi:10.1007/978-1-4684-3497-2_35. ISBN978-1-4684-3497-2.
^V.A. Krongauz; A.A. Parshutkin (May 1972). "The effect of the electric field on photochromism of spiropyrans. The dipole crystallization of a dye along the lines of force". Photochemistry and Photobiology. 15 (5): 503–07. doi:10.1111/j.1751-1097.1972.tb06261.x. S2CID98008302.
^V. A. Krongauz; F. P. Shvartsman; I. R. Cabrera; A. L. Weis; E. J. Wachtel (1985). "Investigation of the quasi-liquid crystal structure". J. Phys. Chem. 89 (18): 3941–46. doi:10.1021/j100264a037.
^V. A. Krongauz; G. R. Meredith; D. J. Williams; S. N. Fishman; E. S. Goldburt (1983). "Optical frequency doubling and the internal structure of quasi-crystals". J. Phys. Chem. 87 (10): 1697–701. doi:10.1021/j100233a012.
^V. A. Krongauz; G. R. Meredith; D. J. Williams; S. N. Fishman; E. S. Goldburt (1983). "6". In D. J. Williams (ed.). Second-Order Nonlinear Media from Spiropyran Merocyanine Quasicrystals in Nonlinear Optical Properties of Organic and Polymeric Materials. ACS Symposium Series. Vol. 233. American Chemical Society. pp. 135–52. doi:10.1021/bk-1983-0233.ch006. ISBN9780841208025.
^V. A. Krongauz; H. Hsiung; Th. Rasing; Y.R. Shen; F. P. Shvartsman; I. Cabrera (1987). "Polar ordering of quasiliquid crystals – An optical second harmonic generation study". J. Chem. Phys. 87 (5): 3127. Bibcode:1987JChPh..87.3127H. doi:10.1063/1.453050. hdl:2066/92707. S2CID9284705.
^G. Berkovic; V. A. Krongauz; V. Weiss (2000). "Spiropyrans and Spirooxazines for Memories and Switches". Chem. Rev. 100 (5): 1741–54. doi:10.1021/cr9800715. PMID11777418.
^US 4405733, Williams, David J.; Gerald R., Meredith & Olin, George R., "Composite quasi-crystalline material", published 1983-09-20, assigned to Xerox Corporation, now expired.
^US 4927917, Krongauz, Valeri A. & Shvartsman, Felix P., "Quasi-liquid crystals", published 1990-05-22, assigned to Yeda Research and Development Co., Ltd., now expired.