Diverse bonding modes of the tetramethyleneethane ligand in binuclear iron carbonyl derivatives

First-Row Transition Metals in Binuclear Cyclopentadienylmetal Derivatives of Tetramethyleneethane: η3,η3 versus η4,η4 Ligand–Metal Bonding Related to Spin State and Metal–Metal Bonds

“…The Co–Co distance of 2.806 Å in Co-5S can be interpreted as a formal single bond to give each cobalt atom the favored 18-electron configuration. Note that a trans -η 4 ,η 4 -TME ligand is a donor of eight electrons, whereas a cis -η 4 ,η 4 -TME ligand is a donor of only six electrons to a pair of metal atoms, as discussed earlier for the binuclear (TME)Fe 2 (CO) n complexes …”

“…Note that a trans-η 4 ,η 4 -TME ligand is a donor of eight electrons, whereas a cis-η 4 ,η 4 -TME ligand is a donor of only six electrons to a pair of metal atoms, as discussed earlier for the binuclear (TME)-Fe 2 (CO) n complexes. 15 3.1.3. (TME)Fe 2 Cp 2 .…”

“…In such a trans -η 4 ,η 4 -TME ligand the central C–C bond of the TME ligand is approximately perpendicular to the metal–metal axis. Previous theoretical studies on binuclear TME iron carbonyl complexes show that trans stereochemistry is required for the each of the central carbon atoms in such bimetallic systems to be a one-electron donor to each metal atom. Therefore, in the (TME)M 2 Cp 2 complexes examined in this research a trans -η 4 ,η 4 -TME ligand is a donor of eight electrons, whereas a cis -η 4 ,η 4 -TME ligand is a donor of only six electrons to a bimetallic unit.…”

Ce1−xSrxO2−δ solid solution supports cobalt-based catalysts for hydrogen production via auto-thermal reforming of acetic acid

“…As a result, high conversion rate and hydrogen yield were detected in the autothermal reforming of acetic acid: the HAc conversion reached 100%, and the hydrogen yield was stable at 2.72 mol-H 2 /mol-HAc along with a TOF at 14.8 × 10 −2 s −1 and an E a at 28.6 kJ mol −1 , while sintering and coking were inhibited. 46 Over the CS3.25 catalyst without Ce, XRD patterns showed that the main crystal phases were SrCO 3 and SrCoO x , and the specific surface area was only 2.25 m 2 g −1 . After reduction with hydrogen, Co species in SrCoO x were reduced to Co 0 , and the phases of Co 0 and SrCO 3 were also observed in XRD and HRTEM.…”