Bis(2-phenyl-4,6-di-2-pyridyl-1,3,5-triazine-κ3 N 4,N 5,N 6)ruthenium(II) bis(hexa­fluoridophosphate)

The asymmetric unit of the title compound, [Ru(C19H13N5)2](PF6)2, consists of an RuII complex cation and two hexa­fluoridophosphate anions. The RuII atom is coordinated by three N atoms from the two outer pyridine and the central triazine rings of each of two tridentate ligands in a distorted octa­hedral environment. The ligands are approximately orthogonal to one another, with a dihedral angle of 88.34 (2)° between planes through the three six-membered rings of the two ligands. The pendant phenyl substituents are almost coplanar with the triazine rings to which they are bound, with dihedral angles of 5.41 (9) and 14.90 (10)°. This is reflected in the previously reported photophysical results with an increased lifetime of the triplet metal to ligand charge transfer (3MLCT) excited state [Fang, Taylor, Hanan, Loiseau, Passalacqua, Campagna, Nierengarten & Van Dorsselaer (2002). J. Am. Chem. Soc. 124, 7912–7913]

(η6-Benzene)(2,2′-bipyridine-κ2 N,N′)chloridoruthenium(II) chloride methanol sesquisolvate

In the title compound, [RuCl(C6H6)(C10H8N2)]Cl·1.5CH4O, the RuII atom is in a distorted octa­hedral environment coordinated by an η6-benzene ring, a chelating 2,2′-bipyridine ligand and a chloride ion. The asymmetric unit is completed by a chloride anion and two methanol mol­ecules, one of which is disordered about a centre of inversion with an occupancy of 0.5. It is an example of a ruthenium complex with a less sterically congested environment than in similar derivatives. In the crystal structure, O—H⋯Cl hydrogen bonds, together with π–π stacking inter­actions [centroid–centroid distances of 3.472Å(2) Å], stabilize the structure

3,3′-Dibromo-5,5′-di-tert-butyl-2,2′-dimethoxy­biphen­yl

The title compound, C22H28Br2O2, crystallizes in a staggered arrangement to minimize the inter­actions of its ortho substituents, with a dihedral angle of 84.2 (3)° between the two aromatic rings. Short C—H⋯O hydrogen-bonding inter­actions between meth­oxy groups result in a one-dimensional polymeric chain of mol­ecules lying parallel to the b axis. One tert-butyl group is disordered equally over two positions

[4′-(2-Bromo-5-pyrid­yl)-2,2′:6′,2′′-terpyridine-κ3 N,N′,N′′]bis(triphenyl­phosphine-κP)­copper(I) tetra­fluorido­borate dichloro­methane hemisolvate

In the title complex, [Cu(C20H13BrN4)(C18H15P)2]BF4·0.5CH2Cl2, the copper(I) cation adopts a distorted tetra­hedral arrangement, coordinated by two triphenyl­phosphine ligands and two N atoms of the potentially tridentate terpyridine ligand. One half-mol­ecule of dichloro­methane crystallizes with the complex. The chlorine atoms are disordered over two sites with occupancies fixed at 0.30 and 0.20 respectively. The N donor atom of the central pyridine inter­acts weakly with the copper centre at a distance of 3.071 Å

Heterodinuclear ruthenium(II)-cobalt(III) complexes as models for a new approach to selective cancer treatment

Heterodinuclear ruthenium(ii)-cobalt(iii) complexes have been prepared as part of investigations into a new approach to selective cancer treatment. A cobalt(iii) centre bearing amine ligands, which serve as models for cytotoxic nitrogen mustard ligands, is connected by a bridging ligand to a ruthenium(ii)-polypyridyl moiety. Upon excitation of the ruthenium centre by visible light, electron transfer to the cobalt(iii) centre results in reduction to cobalt(ii) and consequent release of its ligands. We have synthesised several such structures and demonstrated their ability to release ligands upon excitation of the ruthenium centre by visible light

Chemically-synthesised, atomically-precise gold clusters deposited and activated on titania

Synchrotron XPS was used to investigate a series of chemically-synthesised, atomically-precise gold clusters Au(n)(PPh₃)(y) (n = 8, 9, 11 and 101, with y depending on cluster size) immobilized on titania nanoparticles. The gold clusters were washed with toluene at 100 °C or calcined at 200 °C to remove the organic ligand. From the position of the Au 4f₇/₂ peak it is concluded that cluster size is not altered through the deposition. From the analysis of the phosphorous spectra, it can be concluded that the applied heat treatment removes the organic ligands. Washing and calcination leads to partial oxidation and partial agglomeration of the clusters. Oxidation of the clusters is most likely due to the interaction of the cluster core with the oxygen of the titania surface after removal of ligands. The position of the Au 4f₇/₂ peak indicates that the size of the agglomerated clusters is still smaller than that of Au₁₀₁.David P. Anderson, Jason F. Alvino, Alexander Gentleman, Hassan Al Qahtani, Lars Thomsen, Matthew I. J. Polson, Gregory F. Metha, Vladimir B. Golovko and Gunther G. Andersso

4-[4-(Methylsulfanyl)phenyl]-6-phenyl-2,2′-bipyridine

The structure of the title compound, C23H18N2S, is revealed by X-ray diffraction to be almost planar over all four aromatic rings; the pendant rings are at angles of 10.18, 14.12 and 15.42° relative to the central pyridine ring for the 4-methylsulfanyl, 2-pyridyl and 6-phenyl rings, respectively. The 2,6-aromatic substituents are disordered over two sites in a 0.6:0.4 occupancy ratio