Browsing by Author "Contreras, Raul"

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    Cyclometallated platinum(II) complexes containing the chiral ligand [2-(diphenyl-phosphanyl)-benzylidene]-(1-phenyl-ethyl)-amine: Synthesis and molecular structures of the compounds [PtCl(Me){kappa(2)-(R)-Ph2P(C6H4)CH=NCH(Ph)Me-P,N}] and [Pt{kappa(3)-(S)-Ph2P(C6H4)CH=NCH(C6H4)Me-P,N,C}Py]BF4
    (ELSEVIER SCIENCE SA, 2008) Ramirez, Paola; Contreras, Raul; Valderrama, Mauricio; Carmona, Daniel; Lahoz, Fernando J.; Balana, Ana I.
    Diastoreoisomeric mixtures of the complex [PtIMe3{kappa(2)-Ph2P(C6H4)CH=NCH(Ph)Me-P,N}] (Rc-1) react with AgBF4 and SMePh to give a mixture of complexes [PtMe(SMePh) {kappa(2)-Ph2P(C6H4)CH=NCH(Ph)Me-P,N}]BF4 (2) and [Pt{kappa(2)-Ph2P(C(6)H4)CH=NCH(C6H4)Me-P,N,C}(PhSMe)]BF4 (3) which subsequently render the corresponding chloride compounds [PtClMe{kappa(2)-(R)-Ph2P(C6H4)CH=NCH(Ph)Me-P,N}] (4) and [PtCl{kappa(3)-(R)-Ph2P(C6H4)CH=NCH(C6H4)Me-P,N,C}] (5), by elution with CH2Cl2 on a aluminium oxide chromatography column. Refluxing of [PtIMe3{kappa(2)-Ph2P(C6H4)CH=NC*H(Ph)Me-P,N}] (Sc-1) with AgBF4 in a 1:1, CH2Cl2:Me2CO mixture followed by the addition of SMePh, NCMe or pyridine (Py) affords the corresponding cyclometallated compounds [Pt{kappa(3)-(S)-Ph2P(C6H4)CH=NCH(C6H4)Me-P,N,C}(L)]BF4 [L = SMePh (3), NCMe (9), Py (10)]. These compounds have been characterised by analytical and spectroscopic means and by the molecular structure determination of complexes 4 and 10. (C) 2007 Elsevier B.V. All rights reserved.
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    1D and 2D Nuclear magnetic resonance of new silver(I) complexes with achiral and chiral bases as ligands: Crystal structure of [Ag{(S)-(6-CH3) C5H3N-CHN-C*H(α-CH3)C6H5}(PPh3)2](O3SCF3)
    (2011) Cifuentes, Olga; Contreras, Raul; Laguna, Antonio; Crespo, Olga
    Treatment of equimolar amounts of substituted aniline or amine with substituted benzaldehyde leads to the corresponding achiral or chiral Schiff bases (L). The reaction of the bases with [Ag(O3SCF3)(PPh3)] leads to the preparation of three or four coordinated cationic complexes, [Ag(k(1)-L)(PPh3)(n)](+) (n = 1 or 2) which have been characterized by IR, D-1 and D-2 NMR spectroscopy. The crystal structure of [Ag{(S)-(6-CH3)C5H3N-CHN-C*H(alpha-CH3)C6H5}(PPh3)(2)](O3SCF3) is reported. (C) 2011 Elsevier B.V. All rights reserved.
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    Synthesis and coordination properties of chiral bidentate P,O-donor ligands
    (SOC CHILENA QUIMICA, 2006) Diaz, Oscar; Contreras, Raul; Valderrama, Mauricio
    Reaction of the chiral compound (S)-(+)-BrCH2CHMeCH2OH with Ph2PK in the presence of lithium diisopropylamide (LDA) and BH3/THF yields the monophosphine (S)-Ph2P(BH3)CH2CHMeCH2OH(1). The reaction of 1 with ClOSO2Me/Et2N or NaH/Mel gives rise to the formation of the general compound (S)-Ph2P(BH3)CH2CHMeCH2OR [R = SO2Me (2), Me (5)], which by treatrent with pyrrolidine affords (S)-Ph2PCH2CHMeCH2OR [R = SOMe (4), Me (6)). The monophophines 4, 6 and (S)-PPh2CH2CHMeCH2OH react with [{Cp*IrCl(mu-Cl)(2)] to give the neutral compounds [Cp*IrCl2(PPh2CH2CHMeCH2OR-P)], where only the compound with R - H (7) was fully characterized. Complex 7 reacts with AgBF4 yielding the cationic complex [Cp*IrCl(PPh2CH2CHMeCH2OH-PO)]BF4 (8) in which the ligand acts in its bidentate form. Similar synthetic results were obtained using [jCp*IrI(mu-I)(2)] as starting complex.