A dimer of bis­(N-heterocyclic carbene)rhodium(I) centres spanned by a dibenzo-18-crown-6 bridge from synchrotron radiation

The compound (μ-3,3′,3′′,3′′′-{[2,5,8,15,18,21-hexa­oxatricyclo­[20.4.0.0^9,14]hexa­cosa-1(22),9,11,13,23,25-hexa­ene-11,12,24,25-tetra­yl]tetra­kis­(methyl­ene)}tetra­kis­(1-methyl-1H-imidazol-2-yl))bis­[(η⁴-cyclo­octa-1,4-diene)rhodium(I)] bis­(hexa­fluoridophosphate) acetonitrile sesquisolvate dihydrate, [Rh₂(C₈H₁₂)₂(C₄₀H₄₂N₈O₆)](PF₆)₂·1.5CH₃CN·2H₂O, crystallized from acetonitrile under an atmosphere of diethyl ether. In the crystal structure, the complex cation exhibits two square-planar Rh^I centres, each bound by a cyclo­octa­diene (COD) ligand and by two adjacent imidazolyl­idene N-heterocyclic carbene (NHC) donors from the same phen­oxy ring of the {[dibenzo-18-crown-6-11,12,24,25-tetra­yl]tetra­kis­(methyl­ene)}tetra­kis­(1-methyl-1H-imidazol-2-yl) (L) ligand. The dibenzo-crown ether bridge of L spans the Rh centres and forms hydrogen bonds with water mol­ecules. One water mol­ecule with half occupancy bridges adjacent macrocycles in the lattice. Another water with full occupancy forms weak hydrogen bonds to the crown ether O atoms and is, in turn, part hydrogen bonded by a lattice water with half occupancy. The latter water is within hydrogen-bonding distance of a fourth water also with partial occupancy. The result of these inter­actions is the formation of a layer in the ab plane. Two PF₆⁻ ions, one of which is twofold disordered, and one ordered and one twofold disordered (with 0.5 occupancy) lattice acetonitrile mol­ecules complete the crystal structure.

catena-Poly[[copper(I)-μ-2,6-bis­[4-(pyridin-2-yl)thia­zol-2-yl]pyridine] hexa­fluoridophosphate acetonitrile monosolvate] from single-crystal synchrotron data

The title complex, {[Cu(C₂₁H₁₃N₅S₂)]PF₆·CH₃CN}_n, was formed immediately on adding together a methanol solution containing copper(I) ions and a methanol solution of 2,6-bis­[4-(pyridin-2-yl)thia­zol-2-yl]pyridine. Crystallographic studies of the complex reveal a coordination polymer with the ligand acting as a bis­(bidentate) ligand with the pyridine N atom not coordinating a metal centre. The Cu^I atom is four-coordinate with approximately tetra­hedral stereochemistry: the N₄ donor set is provided by bipyridine-like moieties of the two heterocyclic ligands. Parallel chains of the coordination polymer run along the b-axis direction with the disordered (0.50:0.50 occupancy ratio) PF₆⁻ anions and acetonitrile solvent mol­ecules located between the chains.

Alternariol 9-O-methyl ether dimethyl sulfoxide monosolvate

The title compound (systematic name: 3,7-dihy­droxy-9-meth­oxy-1-methyl-6H-benzo[c]chromen-6-one dimethyl sulfoxide monosolvate), C₁₅H₁₂O₅·C₂H₆OS, was isolated from an unidentified endophytic fungus (belonging to class Ascomycetes) of Taxus sp. In the crystal, both the alternariol 9-O-methyl ether (AME) and the dimethyl sulfoxide (DMSO) mol­ecules exhibit crystallographic mirror symmetry. One of the hy­droxy groups makes bifurcated hydrogen bonds, viz. an intra­molecular bond with the carbonyl group and an inter­molecular bond with the carbonyl group in an inversion-related AME mol­ecule. In the crystal, the AME mol­ecules are organized into stacks parallel with the b axis by π–π inter­actions between centrosymmetrically related mol­ecules [the distance between the centroid of the central ring and the centroid of the meth­oxy-substituted benzene ring in the next mol­ecule of the stack is 3.6184 (5) Å]. Pairs of DMSO mol­ecules, linked via centrosymmetric C—H...O contacts, are inserted into the voids created by the AME mol­ecules, making O—H...O and C—H...O contacts with the hosts.