Abstract
Crystals of the iron(II) nioximate hexadecylboronate clathrochelate complex—FeNx 3(BHd)2 [tris(μ-1,2-cyclohexanedionedioximato-O:O′)di-n-hexadecyldiborato(2−)-N,N′, N″,N‴, N⁗,N″‴]iron(II)—are investigated by differential scanning calorimetry and X-ray diffraction. Two structural phase transitions are revealed at T cr1 = 290(3) K and T cr2 = 190(3) K. The crystal structures of phases I, II, and III are determined by X-ray diffraction analysis at 303, 243, and 153 K, respectively. It is demonstrated that the I ↔ II phase transition is due to a change in the system of translations, and the II ↔ III phase transition is accompanied only by a jumpwise change in the unit cell parameters. The possible mechanisms of phase transitions are discussed in terms of geometry and molecular packing of FeNx 3(BHd)2 in all three phases.
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Translated from Kristallografiya, Vol. 46, No. 5, 2001, pp. 833–844.
Original Russian Text Copyright © 2001 by Vorontsov, Potekhin, Antipin, Voloshin, Stash, Belsky, Dubovik, Papkov.
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Vorontsov, I.I., Potekhin, K.A., Antipin, M.Y. et al. X-ray diffraction study of phase transitions in iron(II) trisnioximate hexadecylboronate clathrochelate complex. Crystallogr. Rep. 46, 758–770 (2001). https://doi.org/10.1134/1.1405862
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DOI: https://doi.org/10.1134/1.1405862