The Experts below are selected from a list of 711 Experts worldwide ranked by ideXlab platform
Peter B Hitchcock - One of the best experts on this subject based on the ideXlab platform.
-
double sandwich Pentalene complexes m2 pent 2 m rh pd pent 1 4 bis triisopropylsilyl Pentalene synthesis structure and bonding
Organometallics, 2012Co-Authors: Owen T Summerscales, Jennifer C Green, Christopher J Rivers, Morgan J Taylor, Peter B Hitchcock, Geoffrey F N ClokeAbstract:The bis(Pentalene) complexes M2(pent†)2 (M = Rh (1), Pd (2); pent† = 1,4-bis(triisopropylsilyl)Pentalene) have been synthesized and structurally characterized. In both 1 and 2 the metals have a for...
-
samarium iii Pentalene sandwich compounds sm η8 c8h4 siipr3 1 4 2 cp and sm η8 c8h4 siipr3 1 4 2 η5 c8h5 siipr3 1 4 2 and a mixed valence hexasamarium cluster derived from sm ii based solvent activation
Organometallics, 2008Co-Authors: Owen T Summerscales, Geoffrey F N Cloke, David R Johnston, Peter B HitchcockAbstract:The reaction of the Pentalene salt C8H4{(SiPr3)-Pr-i-1,4}(2)[K](2) with [SmCp*(mu-I)(THF)(2)](2) yields not the expected Sm(II) Pentalene-bridged dimer but the Sm(III) sandwich complexes [Sm(eta(8)-C8H4{(SiPr3)-Pr-i-1,4}(2))(eta(5)-Cp*)] (1) and [Sm(eta(8)-C8H4{(SiPr3)-Pr-i-1,4}(2))(eta(5)-C8H5{(SiPr3)-Pr-i-1,4}(2))] (2) and the mixed-valence cluster [Cp*Sm-6(6)(OMe)(8)O][K(THF)(6)] (3) via solvent activation of THF. The samarium(III) sandwich compound 2 incorporates an eta(8)-Pentalene ligand and an eta(5)-hydropentalenyl ligand. X-ray crystallography shows the Sm(II)/Sm(III) mixed-valence cluster compound 3 to contain a centrosymmetric hexanuclear array of Cp*Sm units, bridged by face-centered mu(3)-methoxy groups, with a central oxo unit.
-
mononuclear tantalum v Pentalene complexes synthesis of ta η8 c8h4 1 4 siipr3 2 x3 x ch3 cl i and the x ray crystal structures of ta η8 c8h4 1 4 siipr3 2 ch3 3 ta η8 c8h4 1 4 siipr3 2 ch3 2cl ta η8 c8h4 1 4 siipr3 2 ch3 cl2 and ta η8 c8h4 1 4 siipr3 2 i3
Polyhedron, 2004Co-Authors: Geoffrey F N Cloke, Peter B Hitchcock, Matthew C Kuchta, Neil A MorleysmithAbstract:The reaction between [TaMe3Cl2] and the potassium salt of the silylated Pentalene dianion [K2{C8H 4(1,4-SiiPr3)2}] gives the ?8-Pentalene complex [Ta{?8-C8H 4(1,4-SiiPr3)2}(CH3) 3]. The reaction between [TaMe3Cl2] and the potassium salt of the silylated Pentalene dianion [K2{C 8H4(1,4-SiiPr3)2}] gives the ?8-Pentalene complex [Ta{?8-C 8H4(1,4-SiiPr3)2}(CH 3)3] (1). Sequential protonolysis of 1 with [Et 3NH]Cl affords [Ta{?8-C8H 4(1,4-SiiPr3)2}(CH3) 2Cl] (2), [Ta{?8-C8H4(1,4- SiiPr3)2}(CH3)Cl2] (3) and [Ta{?8-C8H4(1,4-SiiPr 3)2}Cl3] (4). An alternative and cleaner route to 4 involves treatment of 1 with BCl3; in an analogous fashion, the reaction of 1 with BI3 gives [Ta{?8-C 8H4(1,4-SiiPr3)2}I 3] (5). The X-ray crystal structures of 1, 2, 3 and 5 are reported.
-
a bimetallic bis Pentalene sandwich complex synthesis and structure of mo2 c8h4 1 4 sipri3 2 2
Organometallics, 1998Co-Authors: Matthew C Kuchta, And Geoffrey F N Cloke, Peter B HitchcockAbstract:The reaction between K2[C8H4(1,4-SiPri3)2] and Mo2(OAc)4 yields Mo2[C8H4(1,4-SiPri3)2]2, the first example of a bimetallic bis-Pentalene sandwich complex to be structurally characterized by X-ray diffraction. Structural data show that the carbon frameworks of the two Pentalene ligands are eclipsed and effectively planar with fold angles of ca. 2° and 3° while the SiPri3 groups are staggered; the Mo−Mo distance is 2.340(1) A.
Geoffrey F N Cloke - One of the best experts on this subject based on the ideXlab platform.
-
bonding in Pentalene complexes and their recent applications
Coordination Chemistry Reviews, 2017Co-Authors: Geoffrey F N Cloke, Jennifer C Green, Alexander F R Kilpatrick, Dermot OhareAbstract:Abstract Molecular orbital (MO) theory is used to describe the bonding in transition metal Pentalene complexes in a variety of its coordination modes. The various MO models account for structural parameters and lead to simple rules for electron counting in Pentalene complexes. Recent applications of Pentalene complexes are also reviewed, in the areas of small molecule activation and catalysis and as molecular models for conducting organometallic polymers.
-
double sandwich Pentalene complexes m2 pent 2 m rh pd pent 1 4 bis triisopropylsilyl Pentalene synthesis structure and bonding
Organometallics, 2012Co-Authors: Owen T Summerscales, Jennifer C Green, Christopher J Rivers, Morgan J Taylor, Peter B Hitchcock, Geoffrey F N ClokeAbstract:The bis(Pentalene) complexes M2(pent†)2 (M = Rh (1), Pd (2); pent† = 1,4-bis(triisopropylsilyl)Pentalene) have been synthesized and structurally characterized. In both 1 and 2 the metals have a for...
-
samarium iii Pentalene sandwich compounds sm η8 c8h4 siipr3 1 4 2 cp and sm η8 c8h4 siipr3 1 4 2 η5 c8h5 siipr3 1 4 2 and a mixed valence hexasamarium cluster derived from sm ii based solvent activation
Organometallics, 2008Co-Authors: Owen T Summerscales, Geoffrey F N Cloke, David R Johnston, Peter B HitchcockAbstract:The reaction of the Pentalene salt C8H4{(SiPr3)-Pr-i-1,4}(2)[K](2) with [SmCp*(mu-I)(THF)(2)](2) yields not the expected Sm(II) Pentalene-bridged dimer but the Sm(III) sandwich complexes [Sm(eta(8)-C8H4{(SiPr3)-Pr-i-1,4}(2))(eta(5)-Cp*)] (1) and [Sm(eta(8)-C8H4{(SiPr3)-Pr-i-1,4}(2))(eta(5)-C8H5{(SiPr3)-Pr-i-1,4}(2))] (2) and the mixed-valence cluster [Cp*Sm-6(6)(OMe)(8)O][K(THF)(6)] (3) via solvent activation of THF. The samarium(III) sandwich compound 2 incorporates an eta(8)-Pentalene ligand and an eta(5)-hydropentalenyl ligand. X-ray crystallography shows the Sm(II)/Sm(III) mixed-valence cluster compound 3 to contain a centrosymmetric hexanuclear array of Cp*Sm units, bridged by face-centered mu(3)-methoxy groups, with a central oxo unit.
-
mononuclear tantalum v Pentalene complexes synthesis of ta η8 c8h4 1 4 siipr3 2 x3 x ch3 cl i and the x ray crystal structures of ta η8 c8h4 1 4 siipr3 2 ch3 3 ta η8 c8h4 1 4 siipr3 2 ch3 2cl ta η8 c8h4 1 4 siipr3 2 ch3 cl2 and ta η8 c8h4 1 4 siipr3 2 i3
Polyhedron, 2004Co-Authors: Geoffrey F N Cloke, Peter B Hitchcock, Matthew C Kuchta, Neil A MorleysmithAbstract:The reaction between [TaMe3Cl2] and the potassium salt of the silylated Pentalene dianion [K2{C8H 4(1,4-SiiPr3)2}] gives the ?8-Pentalene complex [Ta{?8-C8H 4(1,4-SiiPr3)2}(CH3) 3]. The reaction between [TaMe3Cl2] and the potassium salt of the silylated Pentalene dianion [K2{C 8H4(1,4-SiiPr3)2}] gives the ?8-Pentalene complex [Ta{?8-C 8H4(1,4-SiiPr3)2}(CH 3)3] (1). Sequential protonolysis of 1 with [Et 3NH]Cl affords [Ta{?8-C8H 4(1,4-SiiPr3)2}(CH3) 2Cl] (2), [Ta{?8-C8H4(1,4- SiiPr3)2}(CH3)Cl2] (3) and [Ta{?8-C8H4(1,4-SiiPr 3)2}Cl3] (4). An alternative and cleaner route to 4 involves treatment of 1 with BCl3; in an analogous fashion, the reaction of 1 with BI3 gives [Ta{?8-C 8H4(1,4-SiiPr3)2}I 3] (5). The X-ray crystal structures of 1, 2, 3 and 5 are reported.
-
organometallic Pentalene complexes
ChemInform, 2001Co-Authors: Geoffrey F N ClokeAbstract:There has been a recent renaissance in the organometallic chemistry of Pentalene, following the discovery of the first complexes incorporating Pentalene ?8-ligated to a single metal center. This short review outlines recent work in the author's laboratory on the preparation of silylated Pentalene ligands and the subsequent synthesis of novel, monometallic, and bimetallic Pentalene sandwich and half-sandwich complexes of the f- and d-block elements.
Neil A Morleysmith - One of the best experts on this subject based on the ideXlab platform.
-
mononuclear tantalum v Pentalene complexes synthesis of ta η8 c8h4 1 4 siipr3 2 x3 x ch3 cl i and the x ray crystal structures of ta η8 c8h4 1 4 siipr3 2 ch3 3 ta η8 c8h4 1 4 siipr3 2 ch3 2cl ta η8 c8h4 1 4 siipr3 2 ch3 cl2 and ta η8 c8h4 1 4 siipr3 2 i3
Polyhedron, 2004Co-Authors: Geoffrey F N Cloke, Peter B Hitchcock, Matthew C Kuchta, Neil A MorleysmithAbstract:The reaction between [TaMe3Cl2] and the potassium salt of the silylated Pentalene dianion [K2{C8H 4(1,4-SiiPr3)2}] gives the ?8-Pentalene complex [Ta{?8-C8H 4(1,4-SiiPr3)2}(CH3) 3]. The reaction between [TaMe3Cl2] and the potassium salt of the silylated Pentalene dianion [K2{C 8H4(1,4-SiiPr3)2}] gives the ?8-Pentalene complex [Ta{?8-C 8H4(1,4-SiiPr3)2}(CH 3)3] (1). Sequential protonolysis of 1 with [Et 3NH]Cl affords [Ta{?8-C8H 4(1,4-SiiPr3)2}(CH3) 2Cl] (2), [Ta{?8-C8H4(1,4- SiiPr3)2}(CH3)Cl2] (3) and [Ta{?8-C8H4(1,4-SiiPr 3)2}Cl3] (4). An alternative and cleaner route to 4 involves treatment of 1 with BCl3; in an analogous fashion, the reaction of 1 with BI3 gives [Ta{?8-C 8H4(1,4-SiiPr3)2}I 3] (5). The X-ray crystal structures of 1, 2, 3 and 5 are reported.
Matthew C Kuchta - One of the best experts on this subject based on the ideXlab platform.
-
mononuclear tantalum v Pentalene complexes synthesis of ta η8 c8h4 1 4 siipr3 2 x3 x ch3 cl i and the x ray crystal structures of ta η8 c8h4 1 4 siipr3 2 ch3 3 ta η8 c8h4 1 4 siipr3 2 ch3 2cl ta η8 c8h4 1 4 siipr3 2 ch3 cl2 and ta η8 c8h4 1 4 siipr3 2 i3
Polyhedron, 2004Co-Authors: Geoffrey F N Cloke, Peter B Hitchcock, Matthew C Kuchta, Neil A MorleysmithAbstract:The reaction between [TaMe3Cl2] and the potassium salt of the silylated Pentalene dianion [K2{C8H 4(1,4-SiiPr3)2}] gives the ?8-Pentalene complex [Ta{?8-C8H 4(1,4-SiiPr3)2}(CH3) 3]. The reaction between [TaMe3Cl2] and the potassium salt of the silylated Pentalene dianion [K2{C 8H4(1,4-SiiPr3)2}] gives the ?8-Pentalene complex [Ta{?8-C 8H4(1,4-SiiPr3)2}(CH 3)3] (1). Sequential protonolysis of 1 with [Et 3NH]Cl affords [Ta{?8-C8H 4(1,4-SiiPr3)2}(CH3) 2Cl] (2), [Ta{?8-C8H4(1,4- SiiPr3)2}(CH3)Cl2] (3) and [Ta{?8-C8H4(1,4-SiiPr 3)2}Cl3] (4). An alternative and cleaner route to 4 involves treatment of 1 with BCl3; in an analogous fashion, the reaction of 1 with BI3 gives [Ta{?8-C 8H4(1,4-SiiPr3)2}I 3] (5). The X-ray crystal structures of 1, 2, 3 and 5 are reported.
-
a bimetallic bis Pentalene sandwich complex synthesis and structure of mo2 c8h4 1 4 sipri3 2 2
Organometallics, 1998Co-Authors: Matthew C Kuchta, And Geoffrey F N Cloke, Peter B HitchcockAbstract:The reaction between K2[C8H4(1,4-SiPri3)2] and Mo2(OAc)4 yields Mo2[C8H4(1,4-SiPri3)2]2, the first example of a bimetallic bis-Pentalene sandwich complex to be structurally characterized by X-ray diffraction. Structural data show that the carbon frameworks of the two Pentalene ligands are eclipsed and effectively planar with fold angles of ca. 2° and 3° while the SiPri3 groups are staggered; the Mo−Mo distance is 2.340(1) A.
Harry C Dorn - One of the best experts on this subject based on the ideXlab platform.
-
Enhanced Dipole Moments in Trimetallic Nitride Template Endohedral Metallofullerenes with the Pentalene Motif
2016Co-Authors: Jianyuan Zhang, Daniel W Bearden, Tim Fuhrer, Tianming Zuo, Harry C DornAbstract:Although not found to date in empty-cage fullerenes, the fused pentagon motifs (Pentalenes) are allowed in endohedral metallofullerenes (EMFs). We have found that members of the trimetallic nitride template (TNT) EMF Y3N@C2n (n = 39–44) family that contain Pentalene motifs exhibit significant dipole moments. This finding is predicted to be significant for other EMFs with a metal atom orientated toward the Pentalene motif. Chromatographic retention data and computational results for Y3N@C2-C78, Y3N@Cs-C82, and Y3N@Cs-C84 are examples that Pentalene groups lead to a significant induced dipole moment (∼1D). A special case is the Y3N@C2-C78 that contains two Pentalenes in a relatively small cage. The 13C NMR spectrum for Y3N@C2-C78 exhibits strongly deshielded signals for the fullerene cage (155–170 ppm) supporting the presence of the Pentalene motif. In addition, a lengthening of the covalent M–N bond in the internal M3N cluster is found for all reported TNT EMFs that contain one or two Pentalene motifs
-
enhanced dipole moments in trimetallic nitride template endohedral metallofullerenes with the Pentalene motif
Journal of the American Chemical Society, 2013Co-Authors: Jianyuan Zhang, Daniel W Bearden, Tim Fuhrer, Liaosa Xu, Wujun Fu, Harry C DornAbstract:Although not found to date in empty-cage fullerenes, the fused pentagon motifs (Pentalenes) are allowed in endohedral metallofullerenes (EMFs). We have found that members of the trimetallic nitride template (TNT) EMF Y3N@C2n (n = 39–44) family that contain Pentalene motifs exhibit significant dipole moments. This finding is predicted to be significant for other EMFs with a metal atom orientated toward the Pentalene motif. Chromatographic retention data and computational results for Y3N@C2-C78, Y3N@Cs-C82, and Y3N@Cs-C84 are examples that Pentalene groups lead to a significant induced dipole moment (∼1D). A special case is the Y3N@C2-C78 that contains two Pentalenes in a relatively small cage. The 13C NMR spectrum for Y3N@C2-C78 exhibits strongly deshielded signals for the fullerene cage (155–170 ppm) supporting the presence of the Pentalene motif. In addition, a lengthening of the covalent M–N bond in the internal M3N cluster is found for all reported TNT EMFs that contain one or two Pentalene motifs.
-
enhanced dipole moments in trimetallic nitride template endohedral metallofullerenes with the Pentalene motif
Journal of the American Chemical Society, 2013Co-Authors: Jianyuan Zhang, Daniel W Bearden, Tianming Zuo, Timothy J Fuhrer, Harry C DornAbstract:Although not found to date in empty-cage fullerenes, the fused pentagon motifs (Pentalenes) are allowed in endohedral metallofullerenes (EMFs). We have found that members of the trimetallic nitride template (TNT) EMF Y3N@C2n (n = 39-44) family that contain Pentalene motifs exhibit significant dipole moments. This finding is predicted to be significant for other EMFs with a metal atom orientated toward the Pentalene motif. Chromatographic retention data and computational results for Y3N@C2-C78, Y3N@Cs-C82, and Y3N@Cs-C84 are examples that Pentalene groups lead to a significant induced dipole moment (∼1D). A special case is the Y3N@C2-C78 that contains two Pentalenes in a relatively small cage. The (13)C NMR spectrum for Y3N@C2-C78 exhibits strongly deshielded signals for the fullerene cage (155-170 ppm) supporting the presence of the Pentalene motif. In addition, a lengthening of the covalent M-N bond in the internal M3N cluster is found for all reported TNT EMFs that contain one or two Pentalene motifs.