Synthesis, Photophysical Properties, and Photoinduced Luminescence Switching of Trinuclear Diimine Rhenium(I) Tricarbonyl Complexes Linked by an Isomerizable Stilbene-like Ligand

Reaction of bromopentacarbonylrhenium(I) with ferrocenylcarbaldehyde thiosemicarbazones: the first X-ray diffraction studies of metal carbonyl complexes containing bidentate thiosemicarbazone ligands

30 – Technetium and Rhenium

Reversible transformation of two diphenylphosphanido ligands into the neutral tetraphenyldiphosphane ligand.

1,2-eq, eq-re2(co)8(thf)2 : a reactive re2(co)8 fragment that easily activates h-h and c-h bonds

Studies on organometallic compounds with hetero multiple bridges

The title complex has been prepared by treating P2Ph4 either with [ReBr(CO)5] at the reflux temperature of benzene or with [Re2Br2(CO)6(thf)2](thf = tetrahydrofuran) at room temperature in toluene. Three-dimensional X-ray analysis has shown this to be the first example of a diphosphane bridging two co-ordination octahedra joined by a common edge. The substance crystallizes from toluene in the triclinic system, space group P, with cell constants a= 11.110(9), b= 11.538(9), c= 12.913(9)A, α= 95.95(5), β= 102.54(5), γ= 95.92(5)°, and Z= 2. The molecule consists of two rhenium atoms linked by two bromine atoms and by a P–P bridge. The six carbonyl groups are distributed around the two rhenium atoms in two groups of three, each in a fac arrangement, thus completing the six-co-ordination. The normals to the planes defined by Re(1)–Br(1)–Br(2) and by the Re(2)–Br(1)-Br(2) intersect at an angle of 23.4°. Probably important P⋯Br interactions exist, as evidenced by the non-bonding distance of 3.49 A observed, which is ca. 0.4 A less than the van der Waals radii. The P–P bond is 2.308(6)A. Evidence is presented that the products of formula [Re2X2(CO)6(P2Ph4)](X = Cl or I) previously reported have structures probably similar to that of the present complex.

Crystal and molecular structure of di-µ-bromo-µ-tetraphenyldiphosphane-bis[tricarbonylrhenium(I)]

No cleavage of the P–P bond occurs during the reaction of the tetrahydrofuran (thf) complex [Re2Br2(CO)6(thf)2] with P2Ph4 in toluene; an X-ray study shows that the resulting compound contains bridging tetraphenyldiphosphane in a unique type of bonding.

Synthesis, and crystal and molecular structure of µ-dibromo-µ-tetraphenyl-diphosphane-bis[tricarbonylrhenium(I)], a molecule containing a new type of tetraphenyldiphosphane bridge

The crystal and molecular structures of the two bis(amine) complexes of rhenium(I), [ReBr(CO)3(NHR2)2](R = Me or Et), have been studied by X-ray diffraction methods. The complexes crystallize in the monoclinic system, space group P21/n, with cell constants (R = Me)a= 9.023(3), b= 11.537(4), c= 12.199(4)A, β= 97.28(3)°; and (R = Et)a= 7.340(2), b= 9.784(3), c= 22.742(6)A, β= 95.05(2)°. The molecular structure in both cases consists of facially arranged ligands around six-co-ordinate rhenium(I); the two cis amine ligands do not interact appreciably either by intra- or inter-molecular hydrogen bonding. The ethyl derivative reacts with CO2 to give the corresponding carbamato-complex [Re(CO)3(O2CNEt2)(NHEt2)], the latter showing association in solution presumably due to intermolecular hydrogen bonding.

Ishwerlal P. Mavani

Papers

Studies on organometallic compounds with hetero multiple bridges

Crystal and molecular structure of di-µ-bromo-µ-tetraphenyldiphosphane-bis[tricarbonylrhenium(I)]

Synthesis, and crystal and molecular structure of µ-dibromo-µ-tetraphenyl-diphosphane-bis[tricarbonylrhenium(I)], a molecule containing a new type of tetraphenyldiphosphane bridge

Preparation, properties, and crystal and molecular structures of bis(dialkylamine) complexes of rhenium(I)

Preparation, properties, and crystal and molecular structures of bis(dialkylamine) complexes of rhenium(i)