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Biancalana L, Fiaschi M, Zacchini S, Marchetti F. Formation and structural characterization of a diiron aminoalkylidene complex with N-cyano substituent. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2022.121093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Biancalana L, Fiaschi M, Ciancaleoni G, Pampaloni G, Zanotti V, Zacchini S, Marchetti F. A Comparative Structural and Spectroscopic Study of Diiron and Diruthenium Isocyanide and Aminocarbyne Complexes. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2022.120886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Synthesis and crystal structures of arylamidine Ru(III) compounds containing a tetradentate Schiff base ligand from a amine-amine coupling reaction. INORG CHEM COMMUN 2021. [DOI: 10.1016/j.inoche.2020.108361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Àrias Ò, Brandhorst K, Baabe D, Freytag M, Jones PG, Tamm M. Formation of paramagnetic metallacyclobutadienes by reaction of diaminoacetylenes with molybdenum alkylidyne complexes. Dalton Trans 2017; 46:4737-4748. [DOI: 10.1039/c7dt00305f] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The reactions of the molybdenum alkylidyne complex [MesCMo{OCMe(CF3)2}3] with the diaminoacetylenes R2NCCNR2 (NR2 = 4-methylpiperidinyl, NEt2; Mes = 2,4,6-trimethylphenyl) afforded paramagnetic metallacyclobutadiene (MCBD) complexes with diaminodicarbene ligands.
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Affiliation(s)
- Òscar Àrias
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
| | - Kai Brandhorst
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
| | - Dirk Baabe
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
| | - Matthias Freytag
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
| | - Peter G. Jones
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
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Abstract
The synthesis of six new bis(cyano) iron(III) porphyrinate derivatives is reported. The anionic porphyrin complexes utilized tetraphenylporphyrin, tetramesitylporphyrin, and tetratolylporphyrin as the porphyrin ligand. The potassium salts of Kryptofix-222 and 18-C-6 were used as the cations. These complexes have been characterized by X-ray structure analysis, solid-state Mössbauer spectroscopy, and EPR spectroscopy, both in frozen CH2Cl2 solution and in the microcrystalline state. These data show that these anionic complexes can exist in either the (dxz,dyz)(4)(dxy)(1) or the (dxy)(2)(dxz,dyz)(3) electronic configuration and some can clearly readily interconvert. This is a reflection that these two states can be very close in energy. In addition to the effects of varying the porphyrin ligand, subtle effects of the cyanide ligand environment in the solid state and in solution are sufficient to shift the balance between the two electronic states.
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Alegria ECBA, Guedes da Silva MFC, Kuznetsov ML, Cunha SMPRM, Martins LMDRS, Pombeiro AJL. Acylated cyanoimido-complexes trans-[Mo(NCN){NCNC(O)R}(dppe)(2)]Cl and their reactions with electrophiles: chemical, electrochemical and theoretical study. Dalton Trans 2012; 41:13876-90. [PMID: 22699563 DOI: 10.1039/c2dt30867c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Treatment of a dichloromethane solution of trans-[Mo(NCN){NCNC(O)R}(dppe)(2)]Cl [R = Me (1a), Et (1b)] (dppe = Ph(2)PCH(2)CH(2)PPh(2)) with HBF(4), [Et(3)O][BF(4)] or EtC(O)Cl gives trans-[Mo(NCN)Cl(dppe)(2)]X [X = BF(4) (2a) or Cl (2b)] and the corresponding acylcyanamides NCN(R')C(O)Et (R' = H, Et or C(O)Et). X-ray diffraction analysis of 2a (X = BF(4)) reveals a multiple-bond coordination of the cyanoimide ligand. Compounds 1 convert to the bis(cyanoimide) trans-[Mo(NCN)(2)(dppe)(2)] complex upon reaction with an excess of NaOMe (with formation of the respective ester). In an aprotic medium and at a Pt electrode, compounds 1 (R = Me, Et or Ph) undergo a cathodically induced isomerization. Full quantitative kinetic analysis of the voltammetric behaviour is presented and allows the determination of the first-order rate constants and the equilibrium constant of the trans to cis isomerization reaction. The mechanisms of electrophilic addition (protonation) to complexes 1 and the precursor trans-[Mo(NCN)(2)(dppe)(2)], as well as the electronic structures, nature of the coordination bonds and electrochemical behaviour of these species are investigated in detail by theoretical methods which indicate that the most probable sites of the proton attack are the oxygen atom of the acyl group and the terminal nitrogen atom, respectively.
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Affiliation(s)
- Elisabete C B A Alegria
- Centro de Química Estrutural, Instituto Superior Técnico, Technical University of Lisbon, Portugal
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Colebatch AL, Hill AF, Shang R, Willis AC. Synthesis of a Thiocarbamoyl Alkylidyne Complex and Caveats Associated with the Use of [Mo(≡CLi)(CO)2(Tp*)] (Tp* = Hydrotris(3,5-dimethylpyrazol-1-yl)borate). Organometallics 2010. [DOI: 10.1021/om1008296] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Annie L. Colebatch
- Research School of Chemistry, Institute of Advanced Studies, Australian National University, Canberra, Australian Capital Territory, Australia
| | - Anthony F. Hill
- Research School of Chemistry, Institute of Advanced Studies, Australian National University, Canberra, Australian Capital Territory, Australia
| | - Rong Shang
- Research School of Chemistry, Institute of Advanced Studies, Australian National University, Canberra, Australian Capital Territory, Australia
| | - Anthony C. Willis
- Research School of Chemistry, Institute of Advanced Studies, Australian National University, Canberra, Australian Capital Territory, Australia
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Luzyanin KV, Tskhovrebov AG, Carias MC, Guedes da Silva MFC, Pombeiro AJL, Kukushkin VY. Novel Metal-Mediated (M = Pd, Pt) Coupling between Isonitriles and Benzophenone Hydrazone as a Route to Aminocarbene Complexes Exhibiting High Catalytic Activity (M = Pd) in the Suzuki−Miyaura Reaction. Organometallics 2009. [DOI: 10.1021/om900682v] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Konstantin V. Luzyanin
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, TU Lisbon, Avenida Rovisco Pais, 1049-001 Lisbon, Portugal
| | - Alexander G. Tskhovrebov
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, TU Lisbon, Avenida Rovisco Pais, 1049-001 Lisbon, Portugal
- St.Petersburg State University, 198504 Stary Petergof, Russian Federation
| | - M. Carolina Carias
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, TU Lisbon, Avenida Rovisco Pais, 1049-001 Lisbon, Portugal
| | - M. Fátima C. Guedes da Silva
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, TU Lisbon, Avenida Rovisco Pais, 1049-001 Lisbon, Portugal
- Universidade Lusófona de Humanidades e Tecnologias, ULHT Lisbon, 1749-024 Lisbon, Portugal
| | - Armando J. L. Pombeiro
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, TU Lisbon, Avenida Rovisco Pais, 1049-001 Lisbon, Portugal
| | - Vadim Yu. Kukushkin
- St.Petersburg State University, 198504 Stary Petergof, Russian Federation
- Institute of Macromolecular Compounds of Russian Academy of Sciences, Bolshoii Pr. 31, 199004 St.Petersburg, Russian Federation
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Luzyanin KV, Guedes da Silva MFC, Kukushkin VY, Pombeiro AJ. First example of an imine addition to coordinated isonitrile. Inorganica Chim Acta 2009. [DOI: 10.1016/j.ica.2008.02.026] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Luzyanin KV, Pombeiro AJL, Haukka M, Kukushkin VY. Coupling between 3-Iminoisoindolin-1-ones and Complexed Isonitriles as a Metal-Mediated Route to a Novel Type of Palladium and Platinum Iminocarbene Species. Organometallics 2008. [DOI: 10.1021/om800517c] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Konstantin V. Luzyanin
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, TU Lisbon, Avenida Rovisco Pais, 1049-001 Lisbon, Portugal, St.Petersburg State University, 198504 Stary Petergof, Russian Federation, Department of Chemistry, University of Joensuu, P.O. Box 111, FI-80101, Joensuu, Finland, and Institute of Macromolecular Compounds of the Russian Academy of Sciences, Bolshoii Pr. 31, 199004 St.Petersburg, Russian Federation
| | - Armando J. L. Pombeiro
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, TU Lisbon, Avenida Rovisco Pais, 1049-001 Lisbon, Portugal, St.Petersburg State University, 198504 Stary Petergof, Russian Federation, Department of Chemistry, University of Joensuu, P.O. Box 111, FI-80101, Joensuu, Finland, and Institute of Macromolecular Compounds of the Russian Academy of Sciences, Bolshoii Pr. 31, 199004 St.Petersburg, Russian Federation
| | - Matti Haukka
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, TU Lisbon, Avenida Rovisco Pais, 1049-001 Lisbon, Portugal, St.Petersburg State University, 198504 Stary Petergof, Russian Federation, Department of Chemistry, University of Joensuu, P.O. Box 111, FI-80101, Joensuu, Finland, and Institute of Macromolecular Compounds of the Russian Academy of Sciences, Bolshoii Pr. 31, 199004 St.Petersburg, Russian Federation
| | - Vadim Yu. Kukushkin
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, TU Lisbon, Avenida Rovisco Pais, 1049-001 Lisbon, Portugal, St.Petersburg State University, 198504 Stary Petergof, Russian Federation, Department of Chemistry, University of Joensuu, P.O. Box 111, FI-80101, Joensuu, Finland, and Institute of Macromolecular Compounds of the Russian Academy of Sciences, Bolshoii Pr. 31, 199004 St.Petersburg, Russian Federation
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Activation of C–CN bond of propionitrile: An alternative route to the syntheses of 5-substituted-1H-tetrazoles and dicyano-platinum(II) species. Polyhedron 2008. [DOI: 10.1016/j.poly.2008.06.031] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Ustynyuk NA, Gusev OV, Novikova LN, Peterleitner MG, Denisovich LI, Peganova TA, Semeikin OV, Valyaev DA. Redox induced reactions of transition metal π- and σ,π-complexes. J Solid State Electrochem 2007. [DOI: 10.1007/s10008-007-0322-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Kirillov AM, Haukka M, Guedes da Silva MFC, Pombeiro AJL. Synthesis, Characterization and Redox Behaviour of Mono‐ and Dicarbonyl Phosphane Rhenium(I) Complexes Bearing N‐, N,N‐ and N,O‐Type Ligands. Eur J Inorg Chem 2007. [DOI: 10.1002/ejic.200601026] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Alexander M. Kirillov
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, Av. Rovisco Pais, 1049–001 Lisbon, Portugal, Fax: +351‐21‐846‐4455
| | - Matti Haukka
- Department of Chemistry, University of Joensuu, P.O. Box 111, 80101, Joensuu, Finland
| | - M. Fátima C. Guedes da Silva
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, Av. Rovisco Pais, 1049–001 Lisbon, Portugal, Fax: +351‐21‐846‐4455
| | - Armando J. L. Pombeiro
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, Av. Rovisco Pais, 1049–001 Lisbon, Portugal, Fax: +351‐21‐846‐4455
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Luzyanin KV, Kukushkin VY, Haukka M, Pombeiro AJ. The first example of Re(IV)-mediated nitrile–hydroxylamine coupling. INORG CHEM COMMUN 2006. [DOI: 10.1016/j.inoche.2006.04.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Luzyanin KV, Kukushkin VY, Kuznetsov ML, Ryabov AD, Galanski MS, Haukka M, Tretyakov EV, Ovcharenko VI, Kopylovich MN, Pombeiro AJL. Kinetic and Thermodynamic Aspects of the Regioselective Addition of Bifunctional Hydroxylaminooxime-type HO-Nucleophiles to Pt-Complexed Nitriles. Inorg Chem 2006; 45:2296-306. [PMID: 16499396 DOI: 10.1021/ic051909r] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The coupling between coordinated propiononitriles in trans-[PtCln(EtCN)2] (n = 2, 4) and the 1,2-hydroxylaminooximes HON(H)CMe2C(R)=NOH (R = Ph 1, Me 2) proceeds smoothly in CHCl(3) at ca. 40-45 degrees C and gives trans-[PtCln{NH=C(Et)ON(H)CMe2C(R)=NOH}2] (n = 2, R = Ph 5, Me 6; n = 4, R = Ph 7, Me 8) in 80-85% isolated yields. The reaction is highly regioselective, and both spectroscopic (IR; FAB+-MS; 1D 1H, 13C{1H}, and 195Pt NMR; and 2D 1H,13C HMQC, 1H,13C HMBC, and 1H,15N HMQC NMR) and X-ray data for 6-8 suggest that the addition proceeds exclusively via the hydroxylamine moiety of the 1,2-hydroxylaminooxime species; the existence of an oxime group remote from the nucleophile was also confirmed. Heating of 6 in air leads to its conversion to the unusual nitrosoalkane complex [PtCl2{HON=C(Me)C(Me)2N=O}] (9), whereas in the case of 5, only the metal-free salt [H3NC(Me)2C(Ph)=NOH]2(NO3)Cl.H2O (10) was isolated. To compare the kinetic aspects and trends in the addition of both types of nucleophiles (oximes and hydroxylamines; for the latter, see our recent work: Inorg. Chem. 2005, 44, 2944) to coordinated nitriles, a kinetic study of the addition of HON=C(CH2Ph)2 to [Ph3PCH2Ph][PtCl5(EtCN)] (11) to give [Ph(3)PCH(2)Ph][PtCl(5){NH=C(Et)ON=C(CH2Ph)2}] (12) was performed. The calculated rate constant k2 of 3.9 x 10(-6) M(-1) s(-1) at -20 degrees C for the addition of the oxime indicates that the hydroxylamine is, by a factor 1.7 x 10(4), more reactive toward the addition to nitriles than the oxime. Results of the synthetic, kinetic, and theoretical (at the B3LYP level of theory) studies have demonstrated that the high regioselectivity of the reactions of the 1,2-hydroxylaminooximes with ligated nitriles is both kinetically and thermodynamically controlled.
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Affiliation(s)
- Konstantin V Luzyanin
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, Avenida Rovisco Pais, 1049-001 Lisbon, Portugal
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Electron-donor/acceptor properties of carbynes, carbenes, vinylidenes, allenylidenes and alkynyls as measured by electrochemical ligand parameters. J Organomet Chem 2005. [DOI: 10.1016/j.jorganchem.2005.07.111] [Citation(s) in RCA: 103] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Valyaev DA, Semeikin OV, Ustynyuk NA. Redox induced reactions of transition metal vinylidene and related complexes. Coord Chem Rev 2004. [DOI: 10.1016/j.ccr.2004.08.008] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Almeida SS, Guedes da Silva MC, Jerzykiewicz LB, Sobota P, Pombeiro AJ. Cyanide as a versatile Lewis base ligand at a dinitrogen-binding iron(II) centre: mono- and heteronuclear adducts. Inorganica Chim Acta 2003. [DOI: 10.1016/s0020-1693(03)00249-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Cunha SMPRM, Guedes da Silva MFC, Pombeiro AJL. Mixed dinitrogen-organocyanamide complexes of molybdenum(0) and their protic conversion into hydrazide and amidoazavinylidene derivatives. Inorg Chem 2003; 42:2157-64. [PMID: 12639155 DOI: 10.1021/ic026176e] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Organocyanamides, Ntbd1;CNR(2) (R = Me or Et), react with trans-[Mo(N(2))(2)(dppe)(2)] (1, dppe = Ph(2)PCH(2)CH(2)PPh(2)), in THF, to give the first mixed molybdenum dinitrogen-cyanamide complexes trans-[Mo(N(2))(NCNR(2))(dppe)(2)] (R = Me 2a or Et 2b) which are selectively protonated at N(2) by HBF(4) to yield the hydrazide(2-) complexes trans-[Mo(NNH(2))(NCNR(2))(dppe)(2)][BF(4)](2) (R = Me, 3a, or Et, 3b). On treatment with Ag[BF(4)], oxidation and metal fluorination occur, and the ligating cyanamide undergoes an unprecedented beta-protonation at the unsaturated C atom to form trans-[MoF(NCHNR(2))(dppe)(2)][BF(4)](2) (R = Me, 4a, or Et, 4b) compounds which present the novel amidoazavinylidene (or amidomethyleneamide) ligands. Complexes 4 are also formed from the corresponding compounds 3, with liberation of ammonia and hydrazine. The crystal structure of 2b was determined by single-crystal X-ray diffraction analysis which indicates that the N atom of the amide group has a trigonal planar geometry.
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Affiliation(s)
- Sónia M P R M Cunha
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
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Almeida SSPR, Guedes Da Silva MFC, Pombeiro AJL. Electrochemical Behaviour of trans-[FeH(CN)(dppe)2] Adducts. ACTA ACUST UNITED AC 2003. [DOI: 10.1135/cccc20031663] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Electrochemical behaviour of various metallo cyano adducts of trans-[FeH(CN)(dppe)2], viz. the dinuclear complexes [FeH(dppe)2(μ-CN)PdCl2(PPh3)], [FeH(dppe)2(μ-CN)NiCl2(PCy3)], and trinuclear [{FeH(dppe)2(μ-CN)}2(ReOCl3)], [{FeH(dppe)2(μ-CN)}2PtCl(Ph)] and [{FeX(dppe)2(μ-CN)}2WCl3(OH)] (X = Cl or OH, dppe = 1,2-diphenylphosphinoethane, PCy3 = P(C6H11)3), as well as the benzoylisocyanide mononuclear adduct trans-[FeH(CNCOPh)- (dppe)2], is reported. All of them exhibit FeII/FeIII-based oxidations (which are reversible, except for trans-[FeH(CNCOPh)(dppe)2]). The metallocyanide bridges C≡N-Re-N≡C and C≡N-W-N≡C in [{FeH(dppe)2(μ-CN)}2(ReOCl3)] and [{FeX(dppe)2(μ-CN)}2WCl3(OH)], respectively, allow electronic communication between the iron centres, with possible generation of mixed-valence FeII/FeIII complexes whose comproportionation constant could be estimated in the former case. From the values of the measured oxidation potentials, the electrochemical PL and EL ligand parameters have been estimated for the metallocyanide ligands that were shown to behave as stronger net electron donors than organoisocyanides, although weaker than cyanide itself. Ligand-centred reduction processes were also observed to lead, in the cases of complexes trans-[FeH(CNCOPh)(dppe)2] (CNCOPh-based reduction) and [FeH(dppe)2(μ-CN)PdCl2(PPh3)] (PdII-based reduction in the CNPdCl2(PPh3)- metallocyanide ligand), to the dissociation of the adduct, with regeneration of the parent cyano complex trans-[FeH(CN)(dppe)2], thus reflecting the reductive decrease of the electrophilic (or Lewis acidic) character of the benzoyl and {PdCl2(PPh3)} groups.
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Martins LMDRS, Alegria ECBA, Hughes DL, Fraústo da Silva JJR, Pombeiro AJL. Syntheses and properties of hydride–cyanamide and derived hydrogen-cyanamide complexes of molybdenum(iv). Crystal structure of [MoH2(NCNH2)2(Ph2PCH2CH2PPh2)2][BF4]2. Dalton Trans 2003. [DOI: 10.1039/b306368b] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Bokach NA, Haukka M, Pombeiro AJ, Morozkina SN, Kukushkin VY. Concentration dependent switch from addition to substitution in the reaction between salicylaldoxime and a nitrile platinum(IV) complex. Inorganica Chim Acta 2002. [DOI: 10.1016/s0020-1693(02)00867-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Makarycheva-Mikhailova AV, Haukka M, Bokach NA, Garnovskii DA, Galanski M, Keppler BK, Pombeiro AJL, Kukushkin VY. Platinum(iv)-mediated coupling of dione monoximes and nitriles: a novel reactivity pattern of the classic oxime-based chelating ligands. NEW J CHEM 2002. [DOI: 10.1039/b202947b] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ferreira CM, Guedes da Silva MC, Duarte T, Fraústo da Silva JJ, Pombeiro AJ, Michelin RA, Kukushkin VY. Cationic phenyl and chloro-platinum(II) complexes with cyanamides and cyanoguanidine. X-ray structure of trans-[Pt(Ph)(NCNMe2)(PPh3)2][BPh4]. Inorganica Chim Acta 2002. [DOI: 10.1016/s0020-1693(02)00746-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Guedes da Silva MFC, Fraústo da Silva JJR, Pombeiro AJL. Activation of organonitriles toward beta-electrophilic attack. Synthesis and characterization of methyleneamide (azavinylidene) complexes of rhenium. Inorg Chem 2002; 41:219-28. [PMID: 11800610 DOI: 10.1021/ic010841m] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Treatment of the nitrile complexes cis-[ReCl(NCR)(dppe)(2)] (R = aryl; dppe = Ph(2)PCH(2)CH(2)PPh(2)) with [Et(2)OH][BF(4)] or SiMe(3)CF(3)SO(3) in CH(2)Cl(2) led to the formation of the methyleneamide (alkylideneamide or azavinylidene) compounds cis-[ReCl[NC(E)C(6)H(4)X-4](dppe)(2)]Y [E = H; X = OMe (1b), Me (1c), H (1d), F (1e), or Cl (1f), Y = BF(4); E = SiMe(3), X = Me (1c'), Y = CF(3)SO(3)] and trans-[ReCl[NC(H)C(6)H(4)X-4](dppe)(2)][BF(4)] [X = NEt(2) (2a), OMe (2b), H (2d), F (2e), or Cl (2f)]. They were characterized by multinuclear NMR spectrometry and X-ray crystallography (2e) which shows that the methyleneamide ligand exhibits linear (three-electron donor) geometry and behaves as a strong pi-electron acceptor. The complex (31)P[(1)H] and (1)H [NC(H)C(6)H(4)X-4] NMR patterns for the cis isomers were analyzed as ABCD and ABCDX (X part) spin systems, respectively. Complexes 1 and 2 undergo deprotonation by base to form the trans isomers of the corresponding nitrile complexes, trans-[ReCl(NCC(6)H(4)X-4)(dppe)(2)] [X = NEt(2) (3a), OMe (3b), H (3d), F (3e), or Cl (3f)] whose spectroscopic data are also presented and which on protonation give the corresponding trans isomers of the methyleneamide complexes (2). Reactions of cis-[ReCl(NCR)(dppe)(2)] with [Et(3)O][PF(6)] resulted in their oxidation and isomerization to afford trans-[ReCl(NCC(6)H(4)X-4)(dppe)(2)][PF(6)] [X = Me (4c), H (4d), or Cl (4f)].
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Affiliation(s)
- M Fátima C Guedes da Silva
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisbon, Portugal
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Pombeiro AJ. Comparative behaviours of phospha-alkynes and alkynes at electron-rich phosphinic metal centres. J Organomet Chem 2001. [DOI: 10.1016/s0022-328x(01)00997-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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