[{(CO)5Cr}6Ge6]2, A Molecular Organometallic Derivative of the Unknown Zintl Ion [Ge6]2

Kircher, Peter; Hüttner, Gottfried; Heinze, Katja; Renner, Gerd

doi:10.1002/(sici)1521-3773(19980703)37:12<1664::aid-anie1664>3.3.co;2-y

Cited by 13 publications

(16 citation statements)

References 2 publications

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“…However, transition metal compounds such as CpFe(CO) 2 (Cp = C 5 H 5 ), Co(CO) 4 , Cr(CO) 5 etc. can also be used as ligands for the stabilization of a polyhedral cluster core.…”

Section: Introductionmentioning

confidence: 99%

Ge4Br4[Mn(CO)5]4 and Ge6Br2[Mn(CO)5]6: first germanium cluster compounds containing Mn(CO)5 ligands

Schenk

Schnepf

2007

Dalton Trans.

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Cluster compounds of germanium exhibiting germanium-germanium bonds, where the germanium atoms are additionally bound to transition metal ligands, are rare. Here a synthetic pathway to such cluster compounds is described, starting from metastable Ge I halide solutions leading to the two cluster compounds Ge4Br4[Mn(CO)5]4 and Ge6Br2[Mn(CO)5]6, being the first examples of germanium cluster compounds bearing Mn(CO)5 ligands. The Ge6 compound exhibits a novel arrangement of germanium atoms that has not been previously observed in ligand stabilized cluster compounds of germanium, neither with organic nor with transition metal ligands. The bonding situation inside the cluster compounds is discussed, together with a possible reaction pathway that opens the way to metalloid cluster compounds of germanium exhibiting Mn(CO)5 ligands.

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“…However, transition metal compounds such as CpFe(CO) 2 (Cp = C 5 H 5 ), Co(CO) 4 , Cr(CO) 5 etc. can also be used as ligands for the stabilization of a polyhedral cluster core.…”

Section: Introductionmentioning

confidence: 99%

Ge4Br4[Mn(CO)5]4 and Ge6Br2[Mn(CO)5]6: first germanium cluster compounds containing Mn(CO)5 ligands

Schenk

Schnepf

2007

Dalton Trans.

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“…Octahedral [E 6 ] 2− clusters have been isolated only by an organometallic synthetic route as transition metalstabilized species [{EM(CO) 5 } 6 ] 2− (E = Ge, Sn; M = Cr, Mo, W) consisting of an almost perfect E 6 octahedron with each E atom coordinated to an M(CO) 5 fragment, as shown for the first time for E = Sn and M = Cr (Schiemenz & Huttner 1993). However, the anion [{SnCr(CO) 5 } 6 ] 2− was produced when Na 2 [Cr 2 (CO) 10 ] was treated with SnCl 2 in the presence of bipy (bipy = 2,2 -bipyridine) (Kircher et al 1998) (Wade 1976). Each group 14 atom possesses four valence electrons, two of which remain as one 'lone pair' at each vertex equivalent to the covalent exo-BH bonds in boranes.…”

Section: Homoatomic Clusters Of Tetrel Elements (A) Brief Review Of Hmentioning

confidence: 99%

“…As already pointed out, the anion [{SnCr(CO) 5 } 6 ] 2− contains the octahedral subunit [Sn 6 ] 2− in which each tin atom coordinates to a Cr(CO) 5 fragment (figure 5a; Kircher et al 1998). This example shows that the extended Wade's rules for pure main group element clusters are obeyed when the four valence electrons of each Sn atom are considered as two ske and one electron 'lone pair'.…”

Section: (B) Homoatomic E 9 Clusters Bonded To D-block Metalsmentioning

confidence: 99%

Polyhedral nine-atom clusters of tetrel elements and intermetalloid derivatives

Scharfe

Fässler

2010

Phil. Trans. R. Soc. A.

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Homoatomic polyanions have the basic capability for a bottom-up synthesis of nanostructured materials. Therefore, the chemistry and the structures of polyhedral nine-atom clusters of tetrel elements [E 9 ] 4− is highlighted. The nine-atom Zintl ions are available in good quantities for E = Si-Pb as binary alkali metal (A) phases of the composition A 4 E 9 or A 12 E 17 . Dissolution or extraction of the neat solids with aprotic solvents and crystallization with alkali metal-sequestering molecules or crown ethers leads to a large variety of structures containing homoatomic clusters with up to 45 E atoms. Cluster growth occurs via oxidative coupling reactions. The clusters can further act as a donor ligand in transition metal complexes, which is a first step to the formation of bimetallic clusters. The structures and some nuclear magnetic resonance spectroscopic properties of these so-called intermetalloid clusters are reviewed, with special emphasis on tetrel clusters that are endohedrally filled with transition metal atoms.

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“…King and coworkers theoretically investigated the stable structures of Ge n Z clusters (n = 5-11, Z = -6 to + 6). Experimentally, a dianion cluster consisting of six germanium atoms with organometallic protective groups was obtained in matrix and the structure of the Ge 6 moiety was revealed to be octahedron [55]. This means that Ge 6 2-has the closo form which agrees with the prediction of Wade's rule and the result of Si 6 2-.…”

Section: Scheme VI Closomentioning

confidence: 99%

Polyanionic Hexagons: X6n– (X = Si, Ge)

Takahashi

2010

Symmetry

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Abstract:The paper reviews the polyanionic hexagons of silicon and germanium, focusing on aromaticity. The chair-like structures of hexasila-and hexagermabenzene are similar to a nonaromatic cyclohexane (CH 2 ) 6 and dissimilar to aromatic D 6h -symmetric benzene (CH) 6 , although silicon and germanium are in the same group of the periodic table as carbon. Recently, six-membered silicon and germanium rings with extra electrons instead of conventional substituents, such as alkyl, aryl, etc., were calculated by us to have D 6h symmetry and to be aromatic. We summarize here our main findings and the background needed to reach them, and propose a synthetically accessible molecule.

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[{(CO)5Cr}6Ge6]2, A Molecular Organometallic Derivative of the Unknown Zintl Ion [Ge6]2

Cited by 13 publications

References 2 publications

Ge4Br4[Mn(CO)5]4 and Ge6Br2[Mn(CO)5]6: first germanium cluster compounds containing Mn(CO)5 ligands

Ge4Br4[Mn(CO)5]4 and Ge6Br2[Mn(CO)5]6: first germanium cluster compounds containing Mn(CO)5 ligands

Polyhedral nine-atom clusters of tetrel elements and intermetalloid derivatives

Polyanionic Hexagons: X6n– (X = Si, Ge)

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