@article {707,
	title = {Solution behavior and structural diversity of bis(dialkylphosphino)methane complexes of palladium},
	journal = {Inorganic Chemistry},
	volume = {42},
	number = {13},
	year = {2003},
	note = {ISI Document Delivery No.: 697LTTimes Cited: 17Cited Reference Count: 54},
	month = {Jun},
	pages = {4117-4126},
	type = {Article},
	abstract = {The preparation of dipalladium complexes containing sterically nondemanding diphosphine (P-P) ligands of the type R2PCH2PR2 where R = Me (dmpm) or Et (depm) is reported. Variable-temperature H-1 NMR spectra of the Pd-2(1) complexes Pd2X2(dMPM)(2) (X = Cl, Br, or I; the P-P ligands in the Pd-2 complexes are always bridged, but for convenience, the mu-symbol is omitted) show the complexes to be fluxional in solution, the barriers to a ring-flipping process being DeltaGdouble dagger = 37.9, 39.0, and 43.2 +/- 0.9 kJ mol(-1) for the chloro, bromo, and iodo complexes, respectively. Treatment of Pd2X2(P-P)(2) (X = Cl or Br) with X-2 generates the stable, face-to-face Pd-2(II) derivatives trans-Pd2X4(P-P)(2), while oxidation of Pd2I2(P-P)(2) complexes with I-2 generates a new type of symmetrically di-iodo-bridged, five-coordinate complexes Pd2I2(mu-I)(2)(dmpm)(2) and Pd2I2(mu-I)(2)(depm)(2). The molecular crystal structures of four dipalladium(II) complexes are described: trans-Pd2Cl4(dmpm)(2).2CHCl(3), trans-Pd2Br4(dmpm)(2), trans-Pd2Cl4(depm)(2), and Pd2I2(mu-I)(2)(dmpm)(2). Solution NMR and UV-vis absorption spectra are consistent with the solid-state structures determined by X-ray diffraction. The stability of the dimeric Pd(II) complexes is attributed primarily to ligand steric factors.},
	keywords = {bis(diphenylphosphino)methane, DIMERIC COMPLEXES, DPM, HYDROGEN-SULFIDE, LIGANDS, MECHANISTIC ASPECTS, METAL-METAL BONDS, MOLECULAR-STRUCTURE, RAY CRYSTAL-STRUCTURE, RHODIUM(I)},
	isbn = {0020-1669},
	url = {<Go to ISI>://000183945100023},
	author = {Pamplin, C. B. and Rettig, S. J. and Patrick, B. O. and James, Brian R.}
}
@article {339,
	title = {Crystallographic characterization of the palladium(I) dimers, syn-Pd2Cl2(dppmMe)(2) and Pd2Cl2(dpPM)(2); solution conformational behavior of syn- and anti-Pd2Cl2(dppmMe)(2) and their (mu-Se) adducts [dppmMe = mu-1,1-bis(diphenylphosphino)ethane, and dppm},
	journal = {Inorganica Chimica Acta},
	volume = {327},
	year = {2002},
	note = {ISI Document Delivery No.: 509WATimes Cited: 16Cited Reference Count: 51},
	month = {Jan},
	pages = {179-187},
	type = {Article},
	abstract = {An X-ray diffraction study on syn-Pd2Cl2(dppmMe)(2), syn-1, shows an unusual boat-like conformation of the eight-membered Pd2P4C2 ring. This conformation, containing equatorial Me groups, facilitates access of the Pd-Pd bond to small molecules such as CO, SO2, and elemental sulfur or selenium, and makes the syn isomer more reactive than anti-1. A comparison of bond angles around the Pd and P atoms in the syn- and anti-isomers reveals a more strained geometry of the former, which may also contribute to the stronger propensity of syn-1 to form A-frame adducts. Solution NMR/NOE studies on syn- and anti-1 and their (mu-Se) adducts reveal the structural rigidity of these complexes; the Me groups inhibit the interchange of axial and equatorial positions on the bridging methine C-atom, and solution structures correspond to those in the solid state. The X-ray structure of Pd2Cl2(dppm)(2) is, as expected, like that of the corresponding bromo, complex; both are analogous to that of anti-1 which adopts a chair conformation within both the fused, five-membered rings. (C) 2002 Elsevier Science B.V.. All rights reserved.},
	keywords = {1, 1-bis(diphenylphosphino)ethane, Aa-frame complexes, bis(diphenylphosphino)methane, BIS(DIPHENYLPHOSPHINO)METHANE LIGANDS, BRIDGING, CARBON-MONOXIDE, COMPLEXES, DINUCLEAR PALLADIUM(I), METAL-METAL BONDS, MOLECULAR-STRUCTURE, palladium complexes, PLATINUM(I), RAY CRYSTAL-STRUCTURES, SELENIDE, selenium compounds},
	isbn = {0020-1693},
	url = {<Go to ISI>://000173171700020},
	author = {Besenyei, G. and Parkanyi, L. and Gacs-Baitz, E. and James, Brian R.}
}
@article {4544,
	title = {Synthesis and characterization of Group 13 hydrides and metal-metal bonded dimers stabilized by the macrocyclic bis(amidophosphine) ligand [P2N2] ([P2N2] = [PhP(CH2SiMe2NSiMe2CH2)2PPh])},
	journal = {Journal of Organometallic Chemistry},
	volume = {591},
	number = {1-2},
	year = {1999},
	note = {ISI Document Delivery No.: 263HDTimes Cited: 8Cited Reference Count: 39},
	month = {Dec},
	pages = {63-70},
	type = {Article},
	abstract = {Addition of LiAlH4 to the monomeric chlorides syn-MCl[P2N2] (M = Al (1), Ga (2), In (3)) results in the formation of the aluminum hydride syn-AlH[P2N2] (4). The solution H-1- and P-31{H-1}-NMR spectra are consistent with a C-20 symmetric species in solution. The X-ray crystal structure shows the hydride to be monomeric, and free from interaction with either salt (LiCl) or external base (Et2O). The coordination of both phosphines of the macrocycle to the metal center is found in the solid state. Solution molecular weight measurements are consistent with a monomeric structure. The gallium hydride syn-GaH[P2N2] (5) is synthesized by the addition of LiGaH4 to syn-MCl[P2N2] (M = Ga (2), In (3)). This species is unstable and could only be characterized in solution. Reduction of syn-MCl[P2N2] (M = Ga (2), In (3)) with KC8 yields the reduced, dimeric species {syn-M[P2N2]}(2) (M = Ga (6), In (7)). The solution H-1- and P-31{H-1}-NMR spectra are consistent with C-2v symmetric species in solution. The X-ray crystal structures of the gallium and indium complexes confirm the presence of unsupported metal-metal bonds in both cases. The features of the solution H-1- and P-31{H-1}-NMR spectra suggest that both dimers are fluxional in solution. (C) 1999 Elsevier Science S.A. All rights reserved.},
	keywords = {AL-AL, aluminum, CHEMISTRY, CRYSTAL-STRUCTURE, GA-GA, gallium, GALLIUM-GALLIUM BONDS, hydride, indium, INDIUM HYDRIDE, macrocycle, METAL-METAL BONDS, MOLECULAR-STRUCTURE, NEUTRAL COMPLEXES, SUBSTITUTED DIGALLANE},
	isbn = {0022-328X},
	url = {<Go to ISI>://000084118500007},
	author = {Fryzuk,Michael D. and Giesbrecht, G. R. and Rettig, S. J. and Yap, G. P. A.}
}
@article {3566,
	title = {{KINETIC AND MECHANISTIC ASPECTS OF SULFUR ABSTRACTION FROM PD(2)X(2)(MU-S)(MU-DPM)(2) USING DPM OR DPMME [X=HALIDE},
	journal = {Inorganic Chemistry},
	volume = {34},
	number = {9},
	year = {1995},
	note = {ISI Document Delivery No.: QV824Times Cited: 23Cited Reference Count: 30},
	month = {Apr},
	pages = {2278-2286},
	type = {Article},
	abstract = {Solution kinetic and mechanistic studies were performed on the abstraction of sulfur from Pd(2)X(2)(mu-S)(mu-dpm)(2) [X = Cl (2a), Br (2b), I(2c)] using bis(diphenylphosphino)methane (dpm) to give, respectively, Pd(2)X(2)(dpm)(2) [X = Cl (1a), Br (1b), I (1c)] and dpm(S). The reaction is first-order in both 2 and dpm with the reactivity trend in CHCl3 being X = Cl > Br > I. The activation parameters for the chloride system are Delta H-double dagger = 41 +/- 3 kJ mol(-1) and Delta S-double dagger = -127 +/- 10 J K-1 mol(-1), and for the bromide, Delta H-double dagger = 38 +/- 1 kJ mol(-1) and Delta S-double dagger = -144 +/- 4 J K-1 mol(-1), showing the entropy term is dominant in governing reactivity. Low-temperature NMR studies did not reveal the presence of observable intermediates. 2b and 1b undergo rapid diphosphine ligand exchange with dpm-d(2); with 2b, prior to any S-abstraction, Pd2Br2(mu-S)(dpm)(dpm-d(2)) (7b) and Pd2Br2(mu-S)(dpm-d(2))(2) (8b) are present, while Pd2Br2(dpm)(dpm-d(2)) (3b) and Pd2Br2(dpm-d(2))(2) (4b) are formed, as well as 1b and dpm(S)-d(2), in the abstraction reaction of 2b with dpm-d(2). The distribution of products is close to statistical on the basis of the stoichiometries of the reactants. Reaction of 2b with 1,1{\textquoteright}-bis(diphenylphosphino)ethane (dpmMe) proceeds in an analogous way generating 1b, Pd2Br2(dpm)(dpmMe) (5b), Pd2Br2(dpmMe)(2) (6b), dpm(S), and dpmMe(S). In contrast, 1b undergoes slow diphosphine ligand exchange with dpmMe to form 5b and 6b; 2b undergoes no ligand exchange with dpmMe prior to the S-abstraction reaction. The findings are rationalized in terms of postulated intermediates and transition states that include formulations with three equivalent diphosphines. No sulfur abstraction occurs on treating 2b with PPh(3), PPh(2)Me, or Ph(2)P(CH2)(3)PPh(2).},
	keywords = {BIS(DIPHENYLPHOSPHINO)METHANE DPM, BIS-PHOSPHORUS LIGANDS, COMPLEXES, CRYSTAL-STRUCTURE, DERIVATIVES, DINUCLEAR PALLADIUM(I), HYDROGEN-SULFIDE, METAL-METAL BONDS, MONONUCLEAR, Pd(I)},
	isbn = {0020-1669},
	url = {<Go to ISI>://A1995QV82400007},
	author = {Wong, T. Y. H. and Barnabas, A. F. and Sallin, D. and James, Brian R.}
}
@article {3247,
	title = {SYNTHESIS AND CHARACTERIZATION OF DINUCLEAR PALLADIUM COMPLEXES WITH BRIDGING SELENIDE OR SELENOXIDE LIGANDS, INCLUDING X-RAY CHARACTERIZATION OF ANTI-PD2CL2(MU-SE)(MU-DPMME)(2) [DPMME=1,1-BIS(DIPHENYLPHOSPHINO)ETHANE]},
	journal = {Inorganic Chemistry},
	volume = {34},
	number = {24},
	year = {1995},
	note = {ISI Document Delivery No.: TF982Times Cited: 12Cited Reference Count: 41},
	month = {Nov},
	pages = {6118-6123},
	type = {Article},
	abstract = {{The complexes Pd2Cl2(P-P)(2), where (P-P) = mu-bis(diphenylphosphino)methane, dpm, or mu-1,1-bis(diphenylphosphino)ethane, dpmMe, react with elemental selenium to give the A-frame adducts Pd2Cl2(mu-Se)(P-P)(2), which can be oxidized by t-BuOOH to the mu-SeO derivatives. Reaction of H2Se with Pd2Cl2(dpm)(2) generates Pd(2)Ch(2-n)-(SeH)(n)(mu-Se)(dpm)(2) species (n = 0-2). anti-Pd2Cl2(mu-Se)(dpmMe)(2) (2d) crystallizes in the monoclinic space group P2(1)/c with a = 11.986(2) Angstrom},
	keywords = {1, 1-bis(diphenylphosphino)ethane, 2-(DIPHENYLPHOSPHINO)PYRIDINE, BIS(DIPHENYLPHOSPHINO)METHANE DPM, CARBON-MONOXIDE, CHEMISTRY, CRYSTAL-STRUCTURES, DIHYDROGEN, DIMERS, HYDROGEN-SULFIDE, METAL-METAL BONDS},
	isbn = {0020-1669},
	url = {<Go to ISI>://A1995TF98200024},
	author = {Besenyei, G. and Parkanyi, L. and Simandi, L. I. and James, Brian R.}
}
@article {6973,
	title = {ORGANOMETALLIC OXIDES - PREPARATION AND PROPERTIES OF THE TETRAHEDRAL (TD) CUBANE [(ETA-C5(CH3)5)CR(MU-3-O)]4 AND COMPARISON WITH THE D2 [(ETA-C5H5)CR(MU-3-O)]4 AND D2D [(ETA-C5H4CH3)CR(MU-3-O)]4},
	journal = {Organometallics},
	volume = {10},
	number = {4},
	year = {1991},
	note = {ISI Document Delivery No.: FG976Times Cited: 34Cited Reference Count: 41},
	month = {Apr},
	pages = {906-912},
	type = {Article},
	abstract = {{The cubane [(eta-C5(CH3)5)Cr(mu-3-O)]4 (3) was prepared by the reaction between (eta-C5(CH3)5)2Cr (4) and N2O (1:1 molar ratio) in toluene at 80-degrees-C. The structures of 3 and 4 have been determined by X-ray diffraction. 3: M(r) = 813.0, triclinic, P1BAR},
	keywords = {(ETA-5-C5H5)4CR4O4, ANTI-FERROMAGNETIC COMPLEXES, CLUSTERS, METAL-METAL BONDS, MOLECULAR-STRUCTURES, TETRAHYDROFURAN},
	isbn = {0276-7333},
	url = {<Go to ISI>://A1991FG97600021},
	author = {Bottomley, F. and Chen, J. H. and Macintosh, S. M. and Thompson, R. C.}
}
