Binuclear pentafluorophenyl complexes containing halide and/or bis(diphenylphosphino)methane (dppm) as bridging ligands. Molecular structure of [N(PPh3)2][Pt2(µ-I)(µ-dppm)(C6F5)4]·2CHCL3

Casas, José M.; Falvello, Larry R.; Forniés, Juan; Martín, António; Tomás, Milagros

doi:10.1039/dt9930001107

Cited by 10 publications

(11 citation statements)

References 14 publications

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“…All the reactions presented in this paper are summarized in Scheme 1. Complexes [NBu 4 ][(C 6 F 5 ) 2 Pt(μ-X)(μ-dppm)Pt(C 6 F 5 ) 2 ] [X = Cl ( A ), Br ( B )] contain one halogen atom acting as a bridge between the two platinum centers . Thus, two possible pathways for their reactivity toward silver(I) compounds could be expected: (i) elimination of the halogen atoms as the corresponding silver halide or (ii) coordination of the silver atom to the platinum center forming Pt→Ag donor−acceptor bonds.…”

Section: Resultsmentioning

confidence: 99%

“…The C, H, and N analyses and conductance measurements were performed as described elsewhere . Infrared spectra (4000−200 cm -1 ) were recorded from Nujol mulls between polyethylene sheets on a Perkin Elmer 833 or 1710 FTIR spectrophotometer.…”

Section: Methodsmentioning

confidence: 99%

“…NMR measurements were done on either a Varian XL200 or a Unity 300 spectrometer. [NBu 4 ] 2 [(C 6 F 5 ) 2 XPt(μ-dppm)PtX(C 6 F 5 ) 2 ], [NBu 4 ][(C 6 F 5 ) 2 Pt(μ-X)(μ-dppm)Pt(C 6 F 5 ) 2 ] (X = Cl, Br), [Ag(OClO 3 )(PPh 3 )], and [Ag(OClO 3 )(SC 4 H 8 )] were prepared as described elsewhere. All the reactions involving silver reagents were carried out under exclusion of light.…”

Section: Methodsmentioning

confidence: 99%

“…In the course of our current research, we have recently described the syntheses and structural characterization of the anionic dinuclear platinum(II) complexes {[NBu 4 ][(C 6 F 5 ) 2 Pt(μ-X)(μ-dppm)Pt(C 6 F 5 ) 2 ] [X = Cl ( A ), Br ( B ), I ( C )]} with two very different bridging ligands: bis(diphenylphosphino)methane (dppm = Ph 2 PCH 2 PPh 2 ) and a halide ligand . This is not a common situation since most of the complexes containing dppm acting as an exodidentate ligand are formed by two metal centers which are joined by two dppm ligands; and in many cases metal−metal bonds are present as well .…”

Section: Introductionmentioning

confidence: 99%

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Direct Ag−Pt₂ Interactions in Pentafluorophenyl A-Frame Complexes Containing Halide or OH^- and Bis(diphenylphosphino)methane (dppm) as Bridging Ligands. Crystal Structures of [(C₆F₅)₂Pt(μ-OH)(μ-dppm){Ag(PPh₃)}Pt(C₆F₅)₂]·C₇H₈ and [(C₆F₅)₂Pt(μ-SC₄H₈)(μ-dppm)Pt(C₆F₅)₂]·¹/₂C
Casas
¹
,
Falvello
²
,
Forniés
³

et al. 1996
Inorg. Chem.
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Complexes [NBu4][(C6F5)2Pt(μ-X)(μ-dppm)Pt(C6F5)2] (X = Cl, Br) react with AgClO4 and [Ag(OClO3)L] (L = PPh3, SC4H8), yielding different compounds depending on the silver reagent used. The reactions with AgClO4 in wet solvents lead to the syntheses of the complexes [(C6F5)2Pt(μ-X)(μ-dppm){Ag(H2O)}Pt(C6F5)2] [X = Cl (1), Br (2)] in which the existence of two Pt−Ag bonds is postulated. The reactions with [Ag(OClO3)(PPh3)] give similar complexes [(C6F5)2Pt(μ-X)(μ-dppm){Ag(PPh3)}Pt(C6F5)2] [X = Cl (3), Br (4)]. The presence of silver coordinated to the platinum atoms activates the substitution of the halogen bridge; thus, 3 reacts with water, yielding the complex [(C6F5)2Pt(μ-OH)(μ-dppm){Ag(PPh3)}Pt(C6F5)2] (5). Complex 5 can be prepared as well by reaction of [NBu4][(C6F5)2Pt(μ-OH)(μ-dppm)Pt(C6F5)2] (6) with [Ag(OClO3)(PPh3)]. Nevertheless, the reaction of [NBu4][(C6F5)2Pt(μ-Cl)(μ-dppm)Pt(C6F5)2] with the complex [Ag(OClO3)(SC4H8)] does not render the analogous complex to 3, but AgCl precipitates and [(C6F5)2Pt(μ-SC4H8)(μ-dppm)Pt(C6F5)2] (7) is formed. This different behavior depending on the ligand present in the silver complex is probably due to the ability of the tetrahydrothiophene ligand to act as a bridge. Single-crystal X-ray studies of 5 and 7 have been carried out. For 5, the existence of two Pt−Ag bonds with distances 2.791(1) and 2.832(1) Å has been confirmed. Complex 7 shows a distorted six-membered ring skeleton formed by the metal atoms, dppm ligand, and sulfur atom of the SC4H8 group. Compound 5·C7H8 (C74H46AgF20OP3Pt2) crystallizes in the monoclinic system, space group P21/n: a = 14.360(1) Å, b = 21.590(1) Å, c = 21.585(2) Å, β = 90.85(1)°, V = 6691.3(8) Å3, Z = 4. Compound 7·1/2C6H14 (C56H37F20P2Pt2S) crystallizes in the monoclinic system, space group P21/n: a = 22.258(6) Å, b = 11.351(3) Å, c = 22.268(5) Å, β = 106.21(3)°, V = 5402.6(16) Å3, Z = 4.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Direct Ag−Pt₂ Interactions in Pentafluorophenyl A-Frame Complexes Containing Halide or OH^- and Bis(diphenylphosphino)methane (dppm) as Bridging Ligands. Crystal Structures of [(C₆F₅)₂Pt(μ-OH)(μ-dppm){Ag(PPh₃)}Pt(C₆F₅)₂]·C₇H₈ and [(C₆F₅)₂Pt(μ-SC₄H₈)(μ-dppm)Pt(C₆F₅)₂]·¹/₂C
Casas
¹
,
Falvello
²
,
Forniés
³

et al. 1996
Inorg. Chem.
Self Cite
23
1
8
0
View full text Add to dashboard Cite

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“…It is possible that there is steric hindrance with the phosphine substituents in both complexes. This situation has previously been observed in other cis palladium and platinum complexes [16,24] but free rotation of these groups is usually seen [25].…”

Section: Complex Characterisationmentioning

confidence: 80%