Synthesis, Structures, and Bonding of Metal-Rich Metallaboranes Comprising Triply Bridging Borylene and Boride Moieties
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https://figshare.com/articles/dataset/Synthesis_Structures_and_Bonding_of_Metal-Rich_Metallaboranes_Comprising_Triply_Bridging_Borylene_and_Boride_Moieties/13699246
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资源简介：
A series of metal-rich metallaboranes
of groups 7 and 9 comprising
triply bridging borylene and boride units have been isolated and structurally
characterized. Thermolysis of nido-[(RhCp*)2B3H7] (1; Cp* = η5-C5Me5) with [Co2(CO)8] led to the isolation of tetrametallic [(μ3-BH)(RhCp*)2(μ-CO)(μ3-CO){Co2(CO)4}] (2), featuring a triply bridging borylene
unit, and the trimetallic cluster [(μ3-BH)(μ-H)(RhCp*)2(μ-CO)3{Co(CO)}] (3) that contains
a triply bridging hydrido(borylene) unit. The borylene {BH} unit of 2 is coordinated to a deltahedral face of a tetrametallic
tetrahedron in a μ3 fashion. Cluster 3 is a rare example of a tetrahedral metallaborane featuring a hydrido(borylene)
unit. In an attempt to synthesize the Mn analogues of 2 and 3, a similar reaction was carried out with [Mn2(CO)10] that afforded the trimetallic cluster [(μ3-BH)(RhCp*)2(μ-CO)3{MnH(CO)3}] (5) having a triply bridging borylene moiety,
the two heterometallic μ9-boride clusters [(RhCp*)3{Rh(CO)}3(μ-CO)3{MnH(CO)3}B3H2] (6) and [(RhCp*)3{Mn(CO)3}2Rh(CO)2B4H3] (7) and the unusual tetrametallic complex [(RhCp*)2(μ-CO)2(μ3-η3-CO2){Mn2(CO)9}]
(8). Clusters 6 and 7 are both
unusual heterometallic metal-rich boride clusters, where the boride
boron atom is encapsulated inside a tricapped trigonal prism depicting
a μ9-bonding mode. Compound 8 is a unique
example of a metal carbonyl compound in which a CO2 group
is bridging two Rh atoms and one Mn atom in a μ3-η3 fashion. To explore this chemistry with a heavier transition
metal, we have carried out the thermolysis of arachno-[IrCp*H2(B3H7)] (9) with [Mn2(CO)10], which afforded the face-fused
iridaborane cluster [(IrCp*)3{Ir(CO)2}3(μ-CO)(μ3-CO)B] (10). Compound 10 can also be viewed as a boride cluster, where the naked
boron is coordinated to iridium centers in a unique μ5 coordination mode. All of the compounds have been characterized
by 1H, 11B, and 13C NMR spectroscopy
and mass spectrometry, and the structures of 2, 3, 5, 6, 8, and 10 have been unambiguously established by crystallographic
analyses. Computational studies show that a substantial amount of
overlap occurs between the metal frameworks and borylene/boride units.
创建时间：
2021-02-03
