卷 51, 编号 1 (2025)

The reactions of SbI3 with iodides of cations of the pyridinium family in a mixture of acetonitrile and acetone afford two polymeric iodoantimonate complexes: (1-MePy)[SbI4] (I) and (3-Br-1-MePy)[SbI4] (II). Specific features of the crystal structures are determined by X-ray diffraction (XRD). The thermal stability of compounds I and II is evaluated by thermogravimetry. The optical forbidden bandgaps are estimated from the diffuse reflectance spectra.

The reaction of annelated 1,4-dichloro-3a,6a-diaza-1,4-diphosphapentalene (DDPCl2, I) with 2 equivalents of lithium phenyl selenolate (PhSeLi) results in the substitution of the chlorine atoms by the PhSe group and formation of exclusively cis isomer of annelated 1,4-bis(phenylselenyl)-3a,6a-diaza-1,4-diphosphapentalene (II) according to the XRD data. The noncovalent Se···Se interaction (3.968 Е) is observed in the crystal of compound II. The cis-II isomer is by 6.0 kcal/mol thermodynamically more favorable than trans-I according to the DFT/B3LYP/6-31G(d) calculations. The cis-1,4-bis(phenylselenyl) and 1,1-bis(phenylselenyl) isomers (the latter is formed due to the easy migration of the PhSe group) are equilibrated in the solution. Noncovalent N∙∙∙P and Se∙∙∙H interactions participate in the stabilization of the 1,1-isomer. The crystallographic structural information is available at the Cambridge Crystallographic Data Centre (CIF file CCDC no. 2357640).

The reactions of Cr(NO3)3 ⋅ 9H2O with barium and calcium salts of cyclobutane-1,1-dicarboxylic acid (H2Cbdc) in a ratio of 1 : 3 in an aqueous solution are studied. The reaction products isolated in the crystalline state are shown to be compounds formed by the binuclear tetraanionic units Cr2(OH)2(Cbdc)4] 4−, and the nature of the alkaline-earth metal ion introduced into the synthesis affects the dimensionality of the formed polymeric structure. The 2D polymeric compound Ba2Cr2(OH)2(Cbdc)4(H2O)5] ⋅ 3H2O}𝑛 (I) is formed in the reaction with Ba(Cbdc), and the replacement of Ba2+ by Ca2+ results in the formation of the 1D coordination polymer { Ca2Cr2(OH)(Cbdc)4(H2O)6] ⋅ 8H2O}𝑛 (II). The crystal structures of compounds I and II are determined by single-crystal XRD (CIF files CCDC nos. 2344872 (I) and 2344873 (II), respectively).