Catalytic properties of rhenium Communication 2. Dehydrogenation of cyclohexane

Balandin, Alexander A.; Karpeiskaya, E. I.; Tolstopyatova, A. A.

doi:10.1007/bf00918098

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“…The ligands were chosen to cover a range of σ and π electron donating ability. Since rhenium has proven useful in areas such as catalysis, thin film deposition, and building of supramolecules, understanding the sensitivity of the electronic structure in dirhenium compounds to the axial interactions is of importance.…”

Section: Introductionmentioning

confidence: 99%

Better Understanding of the Species with the Shortest Re₂⁶⁺ Bonds and Related Re₂⁷⁺ Species with Tetraguanidinate Paddlewheel Structures

et al. 2007

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A series of compounds has been made containing quadruply bonded Re2(hpp)4X2 species (hpp = the anion of 1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2a]pyrimidine), where X is CF3SO3 (1), CF3CO2 (2), and F (3). The distances of 2.1562(7), 2.1711(5), and 2.1959(4) A for 1-3 show significant effects of the sigma and pi electron donating ability of the axial ligands on the metal-metal distance. With the weakly coordinating triflate ligand the Re-Re distance is the shortest for any quadruple bonded species known. In addition to examining the effects of axial ligands on the Re2(hpp)42+ core, our study of the Re2(hpp)43+ core is being extended beyond the preliminary results previously reported in only one compound [Re2(hpp)4Cl2]PF6 (Dalton Trans. 2003, 1218). We now report the structural characterization by both X-ray and neutron diffraction of the compound [Re2(hpp)4F](TFPB)2, 4 (TFPB = the anion tetrakis[3,5-bis(trifluoromethyl)phenyl]borate), and a detailed study by EPR spectroscopy of [Re2(hpp)4Cl2]PF6 at 9.5, 34.5, and 95 GHz frequencies, using dilute fluid solutions, frozen glass, and neat powder, show that the unpaired electron in the [Re2(hpp)4Cl2]+ ion is in an MO of predominant metal character with little mixing from the guanidinate ligands.

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Section: Introductionmentioning

confidence: 99%

Better Understanding of the Species with the Shortest Re₂⁶⁺ Bonds and Related Re₂⁷⁺ Species with Tetraguanidinate Paddlewheel Structures

et al. 2007

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Catalytic properties of rhenium Communication 2. Dehydrogenation of cyclohexane

Cited by 1 publication

References 2 publications

Better Understanding of the Species with the Shortest Re₂⁶⁺ Bonds and Related Re₂⁷⁺ Species with Tetraguanidinate Paddlewheel Structures

Better Understanding of the Species with the Shortest Re₂⁶⁺ Bonds and Related Re₂⁷⁺ Species with Tetraguanidinate Paddlewheel Structures

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Catalytic properties of rhenium Communication 2. Dehydrogenation of cyclohexane

Cited by 1 publication

References 2 publications

Better Understanding of the Species with the Shortest Re26+ Bonds and Related Re27+ Species with Tetraguanidinate Paddlewheel Structures

Better Understanding of the Species with the Shortest Re26+ Bonds and Related Re27+ Species with Tetraguanidinate Paddlewheel Structures

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Better Understanding of the Species with the Shortest Re₂⁶⁺ Bonds and Related Re₂⁷⁺ Species with Tetraguanidinate Paddlewheel Structures

Better Understanding of the Species with the Shortest Re₂⁶⁺ Bonds and Related Re₂⁷⁺ Species with Tetraguanidinate Paddlewheel Structures