Browsing by Author "VALDERRAMA, M"
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- ItemA MISSING MEMBER OF THE PENTAMETHYLCYCLOPENTADIENYLIRIDIUM FAMILY - SYNTHESIS, REACTIVITY AND X-RAY CRYSTAL-STRUCTURE OF [(C5ME5IR)2(MU-CL)3]CLO4(1988) VALDERRAMA, M; SCOTTI, M; CAMPOS, P; SARIEGO, R; PETERS, K; VONSCHNERING, HG; WERNER, H
- ItemARENE CARBONYL RHODIUM(I) COMPLEXES(1982) VALDERRAMA, M; ORO, LA
- ItemARENE-RHODIUM(I) COMPLEXES WITH TRIMETHYLTETRAFLUOROBENZOBARRELENE - CRYSTAL-STRUCTURE OF [RH(ME3TFB)(1,4-C6H4ME2)]CLO4(1982) USON, R; ORO, LA; FOCESFOCES, C; CANO, FH; GARCIABLANCO, S; VALDERRAMA, M
- ItemAZULENE AS A LIGAND IN CATIONIC RHODIUM AND IRIDIUM COMPLEXES - CRYSTAL-STRUCTURE OF [RH(TFB)(AZ)]PF6(1984) ORO, LA; VALDERRAMA, M; CIFUENTES, P; FOCESFOCES, C; CANO, FH
- ItemBIS(DIPHENYLPHOSPHINO)METHANE AND ITS SULFIDE OR SELENIDE DERIVATIVES AS LIGANDS IN RUTHENIUM(II) AND RHODIUM(III) COMPLEXES - CRYSTAL-STRUCTURE OF [(ETA(6)C(6)ME(6))RU(ETA(3)(SPPH(2))(2)CH)]CLO4(1995) VALDERRAMA, M; CONTRERAS, R; BASCUNAN, M; ALEGRIA, S; BOYS, DReaction of complexes [(eta(6)C(6)Me(6))RuCl2](2) and [(eta(5)C(5)Me(5))RhCl2](2) with the ligands L = Ph(2)PCH(2)PPh(2) (dppm) or Ph(2)PCH(2)P(Se)Ph(2) in benzene solutions led to neutral complexes with the general formula [(ring)MCl(2)(eta(1)L)]. The reactivity of the uncoordinated P atom of dppm has been studied. When the reaction was carried out in methanol solutions, cationic complexes, with the ligands acting in their bidentate form, were obtained. Similar cationic perchlorate complexes were prepared using acetone as solvent in the presence of sodium perchlorate, yielding [(ring)MCl(eta(2)L)]ClO4, where L = Ph(2)PCH(2)PPh(2), Ph(2)PCH(2)P(Se)Ph(2) or Ph(2)P(S)CH2P(S)Ph(2). The complex [(eta(6)C(6)Me(6))RuCl{eta(2)(SPPh)(2) CH2-S,S'}]ClO4 reacted with sodium hydride in tetrahydrofuran or thallium pyrazolate in dichloromethane solution by deprotonation of the coordinated bidentate ligand giving the complex [(eta(6)C(6)Me(6))Ru{eta(3)(SPPh(2))(2)CH-C,S,S'}]ClO4. The structure of this complex has been determined by single crystal X-ray diffraction methods. The complex contains a tridentate C,S,S'-bonded ligand occupying three coordination positions of a distorted octahedral ruthenium centre, with an eta(6)C(6)Me(6) group completing the coordination sphere.
- ItemBIS-OLEFIN-RHODIUM(I) COMPLEXES OF A TRIPOD LIGAND WITH AN O,O,O-DONOR SET(1986) SCOTTI, M; VALDERRAMA, M; ROJAS, S; KLAUI, W
- ItemCATIONIC HOMOBINUCLEAR AND HETEROBINUCLEAR RUTHENIUM(II)-RHODIUM(III) COMPLEXES WITH DIMETHYL PHOSPHONATE AND HALIDES AS BRIDGING LIGANDS(1995) VALDERRAMA, M; CONTRERAS, R; ACEVEDO, JThe synthesis of new anionic complexes of formula [(ring)MX(2){PO(OMe)(2)}](-) is described; they have been used as tridentate X,X',O-tripod-like ligands for the preparation of bimetallic compounds [{(ring)M}(2)(mu-1)(2){mu-PO(OMe)(2)}](+) and [(eta(6)-MeC(6)H(4)Pr(1))Ru(mu-Cl)(2){mu-PO(OMe)(2)}Rh(eta(5)-C(5)Me(5))](+).
- ItemCATIONIC ORGANOMETALLIC COMPLEXES WITH HEXAALKYLBORAZINES .1. SYNTHESIS AND REACTIVITY OF CATIONIC HEXAMETHYLBORAZINERHODIUM COMPLEXES WITH CARBONYL, ETHYLENE AND DIOLEFINS AS LIGANDS(1985) SCOTTI, M; VALDERRAMA, M; GANZ, R; WERNER, H
- ItemCATIONIC RHODIUM TETRAFLUOROBENZOBARRELENE COMPLEXES WITH DIOLEFIN OR ARENE LIGANDS, CRYSTAL-STRUCTURES OF [RH(TFB)(ARENE)]CLO4, (ARENE=C6ME6, C6H3ME3, C6H4ME2)(1981) USON, R; ORO, LA; FOCESFOCES, C; CANO, FH; VEGAS, A; VALDERRAMA, M
- Item[CP-ASTERISK-IR(P(O)(OME)2)3]-, AN IRIDIUM(III) PHOSPHONATE COMPLEX ACTING AS A CHELATING OXYGEN LIGAND - SYNTHESIS AND COORDINATION CHEMISTRY(1993) SCOTTI, M; VALDERRAMA, M; CAMPOS, P; KLAUI, WThe anionic iridium complex [(C5Me5)Ir{P(O)(OMe)2}3]- (L-) has been prepared as sodium salt from the corresponding trimethyl phosphite complex [(C5Me5)Ir{P(OMe)3}3](ClO4)2. L- reacts with metal ions M2+ to give ML2. With [PtMe3]2SO4 - 4H2O in water and with [{RhCl(cod)}2], cod = 1,5-cyclooctadiene, in cyclohexane solution the air-stable heterobimetallic complexes [LPtMe3] and [LRh(cod)] are formed. The rhodium complex [(C5Me5)Rh{P(O)(OMe)2}3]- (L'-) similarly gives [L'PtMe3] and [L'Rh(cod)]. [LRh(cod)] and [L'Rh(cod)] react with CO gas (1 atm.) to yield [LRh(CO)2] and [L'Rh(CO)2]. Partial decarbonylation of these dicarbonyl complexes at room temperature leads to the tetranuclear complexes [L'Rh(mu-CO)3RhL'](Rh-Rh) and [LRh(mu-CO)3RhL](Rh-Rh).
- ItemDUROQUINONERHODIUM(I) COMPLEXES - CRYSTAL-STRUCTURE OF [RH(DQ)(C6H5ME)]PF6(1985) VALDERRAMA, M; SCOTTI, M; GANZ, R; ORO, LA; LAHOZ, FJ; FOCESFOCES, C; CANO, FH
- ItemFLUORINATED BARRELENE RUTHENIUM(II) COMPLEXES WITH ANIONIC CHELATING LIGANDS(1985) VALDERRAMA, M; SCOTTI, M; ROJAS, A
- ItemHOMOBINUCLEAR AND HETEROBINUCLEAR COMPLEXES CONTAINING THE ANION [RH(C5ME5)(PO(OME)2)2(PYRAZOLATE)]- AS LIGAND - CRYSTAL-STRUCTURE OF [(C5ME5)RH(MU-PO(OME)2)2(MU-C3H3N2)-RU(C6H6)]CLO4.CH2CL2(1992) VALDERRAMA, M; SCOTTI, M; CUEVAS, J; CARMONA, D; LAMATA, MP; REYES, J; LAHOZ, FJ; ONATE, E; ORO, LAThe neutral rhodium(III) complex [Rh(C5Me5)I{PO(OMe)2}{P(OH)(OMe)2}] reacts with pyrazole-type ligands [HL = pyrazole (Hpz), 3-methylpyrazole, or 3,5-dimethylpyrazole] in the presence of AgClO4 yielding cationic complexes of the general formula [Rh(C5Me5){PO(OMe)2}{P(OH)(OMe)2}(HL)]ClO4. They react with Na2CO3 in aqueous solutions with formation of the neutral complexes [Rh(C5Me5){PO(OMe)2}2(HL)]. Addition of NaH in tetrahydrofuran to the cationic complexes or thallium acetylacetonate in MeOH to the neutral compounds affords the corresponding bimetallic derivatives [(C5Me5)Rh{PO(OMe)2}2LM] (M = Na or Tl). These complexes react with halide compounds such as [{M(ring)Cl2}2] [M(ring) = Rh(C5Me5), Ir(C5Me5), Ru(C6H6), Ru(C6H5Me), Ru(MeC6H4Pri-p) or Ru(C6Me6)], [MBr(CO)5], [(PtMe3I)4] or [{Rh(mu-Cl)(cod)}2] (cod = cycloocta-1,5-diene) to give cationic or neutral complexes of the type [(C5Me5)Rh{mu-PO(OMe)2}2(mu-L)M(ring)]ClO4 or [(C5Me5)Rh{PO(OMe)2}2(mu-L)MLn] [ML(n) = Re(CO)3, Mn(CO)3, PtMe3 or Rh(cod)]. The crystals structure of [(C5Me5)Rh{mu-PO(OMe)2}2(mu-pz)Ru(C6H6)]ClO4.CH2Cl2 has been determined by X-ray diffraction methods:monoclinic,space group P2(1)/c, a = 1.179(1), b = 17.039(1), c = 18.186(2) angstrom, beta = 94.85(1)-degrees and Z = 4. The complex cation consists of one rhodium and one ruthenium atom bridged by two phosphonate and one pyrazolate anion. An eta5-C5Me5 and an eta6-C6Me6 group complete the co-ordination spheres of the metals, which show no direct intermetallic interaction.
- ItemORGANOMETALLIC CHELATING LIGANDS - SYNTHESIS OF A NEW ANIONIC TRIPOD LIKE LIGAND WITH AN N,N',O-DONOR SET - X-RAY CRYSTAL-STRUCTURE OF [(ETA(6)-C6ME6)RU(MU-P(O)(OME)2)(MU-PZ)2RE(CO)3] (ME=METHYL, PZ=PYRAZOLATE)(1994) SCOTTI, M; VALDERRAMA, M; MORENO, R; LOPEZ, R; BOYS, DThe synthesis of the new anionic organometallic chelating ligand [(eta6-C6Me6)Ru{P(O)(OMe)2}(Pz)2]- = L-(Me = methyl, Pz = pyrazolate) is described. This ligand was isolated as its neutral sodium derivative NaL. approximately 0.7NaPF6, which is a new synthetic precursor for obtaining heterobimetallic complexes with phosphonate and pyrazolate groups acting as bridging ligands. The heterobimetallic compound LRe(CO)3 was obtained by reaction of ReBr(CO)5 with NaL. approximately 0.7NaPF6, in which the anionic complex L- is acting as an N,N',O-tripod donor ligand. The structure of the title complex was established by X-ray crystallography. The compound crystallizes as monoclinic, space group Cc (No. 9) with a=31.214(6), b=11.111(2), c=15.769(3) angstrom, beta=103.14(3)-degrees. The neutral complex has a binuclear structure with the (C6Me6)Ru and Re(CO)3 Moieties triply bridged by two pyrazolate groups and one phosphonate group. The synthesis of TlPz is also described.
- ItemPREPARATION AND PROPERTIES OF CATIONIC TRIMETHYLPHOSPHITE-RHODIUM(I) COMPLEXES WITH ARENE LIGANDS(1988) VALDERRAMA, M; SCOTTI, M; MERIGGIO, F
- ItemPREPARATION AND PROPERTIES OF PALLADIUM(II) AND RHODIUM(I) COMPLEXES CONTAINING BIDENTATE PHOSPHINE SULFIDE AND SELENIDE LIGANDS(1993) CONTRERAS, R; VALDERRAMA, M; YANEZ, SThe synthesis and properties of cationic complexes of general formula (ML2{CH2(Ph2PE)2)]BF4, where M = Pd(II) and Rh(II), L2 = eta3-MeC3H4, {P(O)(OR)2}2H (R = Me, Et), COD, (CO)2, (CO)PPh3 and E = S, Se are described. The methylene proton of the coordinated phosphine sulphide or selenide ligands react with strong bases as BuLi in n-hexane or NaH in THF, to give neutral complexes of the type [ML2{CH(Ph2PE)2)], where M = Pd(II), Rh(I); L2 = eta3-MeC3H4, COD and E = S, Se. The complexes have been characterized by elemental analyses, molar conductivities, i.r., H-1 n.m.r. and P-31{H-1} n.m.r. spectroscopy.
- ItemRHODIUM(I) COMPLEXES IN HYDROGEN TRANSFER-REACTIONS TO KETONES AND ALDEHYDES(1986) SARIEGO, R; CARKOVIC, I; MARTINEZ, M; VALDERRAMA, M
- ItemRHODIUM(I) DIOLEFIN COMPLEXES WITH POLYCYCLIC PI-ARENE LIGANDS - SYNTHESIS OF BIMETALLIC COMPLEXES WITH DIPHENYLMETHANE AS BRIDGING LIGAND(1984) VALDERRAMA, M; SCOTTI, M; CIFUENTES, P; GANZ, R
- ItemSYNTHESIS AND CHARACTERIZATION OF MANGANESE AND RHENIUM TRICARBONYL COMPLEXES WITH (O,O,O)-DONOR LIGANDS(1985) KLAUI, W; OKUDA, J; SCOTTI, M; VALDERRAMA, M
- ItemSYNTHESIS AND CHELATING PROPERTIES OF SECONDARY ALKYLPHOSPHITE AND ALKYLPHOSPHONATE PALLADIUM(II) COMPLEXES(1990) VALDERRAMA, M; SCOTTI, M; ABUGOCH, L