Monika Kučeráková

Redetermination of NaGdS2, NaLuS2 and NaYS2.

The title structures NaGdS2 (sodium gadolinium sulfide), NaLuS2 (sodium lutetium sulfide) and NaYS2 (sodium yttrium sulfide) were redetermined in order to improve the structural information available for the family of group 1 and thallium rare earth sulfides, which are isostructural with the rhombohedral α-NaFeO2 structure type. In particular, the present investigation has been directed at the rhombohedral sodium rare earth sulfides. The observed dependence of the fractional coordinate z(S(2-)) on the identity of the rare earth element in the newly determined structures is in agreement with the known structures of the potassium and rubidium analogues. Crystals of NaGdS2 and NaLuS2 display obverse-reverse twinning.

10-Vertex closo-carborane: a unique ligand platform for porous coordination polymers

1,10-Dicarboxy-1,10-dicarba-closo-decaborane, a classical dicarboxylate spacer ligand type similar to the prototypical terephthalic acid, proved to be different not only from the latter, but also from its closest relative compound, 1,12-dicarboxy-closo-1,12-dicarbadecaborane, with regard to the topology of its derived PCPs. Highly porous and robust compounds of zinc (rob net) and cobalt (‘quasi’ pcu) as well as a topologically unexpected copper compound (lvt) define the individuality of the 10-vertex carborane cage as a new fundamental spacer type in PCP chemistry. A combination of a lower steric demand compared to the 12-vertex analogue, a preferred orientation angle of 45° between the carboxylate planes and a moderately low rotation barrier are held responsible for the uniqueness of the 10-vertex analogue.

4,4'-Difluoro-2,2'-[imidazolidine-1,3-diylbis(methyl-ene)]diphenol.

The imidazolidine ring in the title compound, C19H24N2O2, adopts a twist conformation and its mean plane (r.m.s. deviation = 0.19 Å) makes dihedral angles of 72.38 (9) and 71.64 (9)° with the two pendant aromatic rings. The dihedral angle between the phenyl rings is 55.94 (8)°. The molecular structure shows the presence of two intramolecular O—H⋯N hydrogen bonds between the phenolic hydroxyl groups and N atoms with graph-set motif S(6). In the crystal, C—H⋯O hydrogen bonds lead to the formation of chains along the b-axis direction.

3,3′-(Ethane-1,2-diyl)bis(6-meth­oxy-3,4-dihydro-2H-1,3-benzoxazine) mono­hydrate

The asymmetric unit of the title compound, C20H24N2O4·H2O, contains one half-organic molecule (an inversion centre generates the other half of the molecule) and a half-molecule of water (the O atom has site symmetry 2). The near planarity of the fused-benzene ring is illustrated by the very small deviations of all the atoms from the plane [largest deviation = 0.0092 (11) Å. The six-membered N,O-containing ring adopts a half-chair conformation. The observed N—CH2 and CH2—O bond lengths can be correlated to the manifestation of an anomeric effect in the N—CH2—O unit. In the crystal, the molecules are connected into zigzag chains parallel to [001] through O—H⋯N hydrogen bonds formed between the oxazinic N atom and the solvent water molecule. The chains are consolidated by C—H⋯O interactions.

Analysis of P–O–C, P–S–C and P–O–P angles: a database survey completed with four new X-ray crystal structures

Four new crystal structures, P(O)(OC6H5)2(NHNHC6H5) (I), P(S)(OCH3)2(NHCH(CH3)2) (II), P(S)(OCH3)2(NH-cyclo-C5H9) (III) and [2–Cl–C6H4CH2NH3]2[(CH3S)P(O)(O)–O–P(O)(O)(SCH3)] (IV) were studied. The P–O–C angles were analyzed, considering phosphoryl compound (I) and thiophosphoryl compounds (II) and (III) and their analogous structures deposited in the Cambridge Structural Database (CSD), including 282 P(O)(O)2(N) structures (706 P–O–C angles) and 186 P(S)(O)2(N) structures (518 P–O–C angles) with at least one P–O–C angle. The maximum populations of P–O–C angles are within 120°–122° in both P(O)(O)2(N) and P(S)(O)2(N) families of structures, confirming the hybridization state close to sp2 for the oxygen atom of P–O–C. A survey on the CSD resulted in 11 P(O)(O)2(S–C) structures (11 P–S–C angles), and the structure (IV) belonging to this family of compounds is the first diffraction study of a salt with a (S)P(O)(O)–O–P(O)(O)(S) skeleton in the anion component. For the P–S–C angles, the maximum population was found in the range of 100°–104° showing the angles within those related to unhybridized pure p orbitals (p3) and hybridized sp3 for the sulfur atom of P–S–C. The analysis of 187 P(O)–O–P(O) structures (with no restriction on the other two atoms attached to phosphorus) including 538 P–O–P angles yielded the maximum population of P–O–P angles within 132°–134°, showing the more pronounced “s” character of the orbital (with respect to the sp2 and toward sp) for the oxygen atom at the P–O–P moiety.

Acetonyltriphenyl-phospho-nium nitrate.

Crystals of the title salt, C21H20OP+·NO3 −, are composed of acetonyltriphenylphosphonium cations and nitrate anions that mainly interact through electrostatic forces. The P atom in the cation has a slightly distorted tetrahedral environment, with C—P—C angles ranging from 104.79 (7) to 112.59 (6)°. The sum of O—N—O angles of the nitrate anion is 359.99°, reflecting its trigonal–planar character. C—H⋯O hydrogen bonds help to consolidate the crystal packing.

Synthesis, characterization, Hirshfeld surface and theoretical properties of \((\hbox {C}_{7}\hbox {H}_{10}\hbox {N})_{4} [\hbox {H}_{2}\hbox {P}_{2}\hbox {Mo}_{5}\hbox {O}_{23}]\cdot \hbox {H}_{2}\hbox {O}\)

The reaction of molybdic acid, phosphoric acid and copper(II) sulfate pentahydrate with m-toluidine in aqueous solution at room temperature furnished a new diphosphopentamolybdate (C7H10N)4[H2P2Mo5O23]·H2O\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}

meso-4,4'-Dimeth-oxy-2,2'-{[(3aR,7aS)-2,3,3a,4,5,6,7,7a-octa-hydro-1H-benz-imidazole-1,3-di-yl]bis-(methyl-ene)}diphenol.

\hbox {C}_{7}\hbox {H}_{10}\hbox {N})_{4}[\hbox {H}_{2}\hbox {P}_{2}\hbox {Mo}_{5}\hbox {O}_{23}]\cdot \hbox {H}_{2}\hbox {O}