Dibromidobis(3-bromobenzyl-κC)(4,7-diphenyl-1,10-phenanthroline-κ2 N,N′)tin(IV)

In the title compound, [SnBr2(C7H6Br)2(C24H16N2)], the Sn atom is coordinated to a 4,7-diphenyl-1,10-phenanthroline, two 3-bromobenzyl and two bromide ligands, leading to a six-coordinate C2Br2N2 donor set. The bromobenzyl ligands are trans to each other, while the Br anions are in a cis arrangement. One of the two 3-bromobenzyl ligands is disordered over two similar conformations, with occupancies of 0.7078 (18) and 0.2922 (18). In the crystal, molecules are linked into centrosymmetric dimers by Br...Br halogen bonds [3.5972 (12) Å], which are linked into a supramolecular layer in the ac plane by weak intermolecular C—H...Br interactions.

Crystal structure of (4,4′-bipyridyl-κN)bis[N-(2-hydroxyethyl)-N-isopropyldithiocarbamato-κ2S,S′]zinc(II)–4,4′-bipyridyl (2/1) and its isostructural cadmium(II) analogue

The title structures, [M(C6H12NOS2)2(C10H8N2)]·0.5C10H8N2, forM= Zn, (I), and Cd, (II), feature terminally bound 4,4′-bipyridyl ligands and non-coordinating 4,4′-bipyridyl molecules, with the latter disposed about a centre of inversion. The coordination geometry about the metal atom is defined by two non-symmetrically chelating dithiocarbamate ligands and a pyridyl N atom. The NS4donor sets are distorted but, approximate to trigonal bipyramidal in each case. In the crystal, hydroxy-O—H...O(hydroxy) and hydroxy-O—H...N(pyridyl) hydrogen bonds between the zinc-containing molecules lead to a supramolecular layer parallel to (100). The three-dimensional architecture arises as the layers are linkedviamethine-C—H...S, pyridyl-C—H...O(hydroxy) and π–π [inter-centroid distance between coordinated pyridyl rings = 3.6246 (18) Å] interactions. Channels along thec-axis direction are occupied by the non-coordinating 4,4′-bipyridine molecules, which are held in place by C—H...π(chelate ring) contacts.

Crystal structure of ethyl (E)-4-(4-chlorophenyl)-4-methoxy-2-oxobut-3-enoate

In the title compound, C13H13ClO4, the dihedral angle between the chlorobenezene ring and the least-squares plane through the 4-methoxy-2-oxobut-3-enoate ethyl ester residue (r.m.s. deviation = 0.0975 Å) is 54.10 (5)°. In the crystal, molecules are connected by methoxy–ketone and benzene–carboxylate carbonyl C—H...O interactions, generating a supramolecular layer in theacplane.

Crystal structure of 2-phenyl-2λ4,3-ditelluratetracyclo[5.5.2.04,13.010,14]tetradeca-1(12),4,6,10,13-pentaen-2-ylium trifluoromethanesulfonate

In the title compound, C18H13Te2+·CF3O3S−, the TeIIatom of the cation and one O atom of the trifluoromethanesulfonate counter-ion form a close-to-linear Te—Te—O system, with a Te—Te—O angle of 172.3 (1)° and a Te—O distance of 2.816 (5) Å, which may suggest the presence of a three-centre–four-electron (3c–4e) bond. Secondary Te...O interactions [3.003 (4) and 3.016 (4) Å], involving the second TeIIatom of the binuclear molecule, are also noted, resulting in a supramolecular layer in thebcplane.