51
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Kopylovich MN, Mahmudov KT, Guedes da Silva MFC, Martins LM, Kuznetsov ML, Silva TF, Fraústo da Silva JJ, Pombeiro AJ. Trends in properties of para
-substituted 3-(phenylhydrazo)pentane-2,4-diones. J PHYS ORG CHEM 2010. [DOI: 10.1002/poc.1824] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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52
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Seibert AR, Dougherty WG, Kassel WS, Nataro C. Bis(dialkylaminophosphino)ferrocenes: Reactivity and electrochemistry. Inorganica Chim Acta 2010. [DOI: 10.1016/j.ica.2010.06.061] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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53
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Voltammetry of half-sandwich manganese group complexes of η6-PhC3B7H9 and η5-C60Bn2PhH2, two ligands that are cyclopentadienyl mimicks. Inorganica Chim Acta 2010. [DOI: 10.1016/j.ica.2010.05.040] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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54
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Zobi F. Ligand Electronic Parameters as a Measure of the Polarization of the C≡O Bond in [M(CO)xLy]n Complexes and of the Relative Stabilization of [M(CO)xLy]n/n+1 Species. Inorg Chem 2010; 49:10370-7. [DOI: 10.1021/ic101246a] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Fabio Zobi
- Institute of Inorganic Chemistry, University of Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
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55
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Mandell CL, Kleinbach SS, Dougherty WG, Kassel WS, Nataro C. Electrochemistry of 1,1′-Bis(2,4-dialkylphosphetanyl)ferrocene and 1,1′-Bis(2,5-dialkylphospholanyl)ferrocene Ligands: Free Phosphines, Metal Complexes, and Chalcogenides. Inorg Chem 2010; 49:9718-27. [DOI: 10.1021/ic1016164] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chelsea L. Mandell
- Department of Chemistry, Lafayette College, Easton, Pennsylvania 18042, United States
| | - Shannon S. Kleinbach
- Department of Chemistry, Lafayette College, Easton, Pennsylvania 18042, United States
| | - William G. Dougherty
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - W. Scott Kassel
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Chip Nataro
- Department of Chemistry, Lafayette College, Easton, Pennsylvania 18042, United States
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56
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Chen J, Szalda DJ, Fujita E, Creutz C. Iron(II) and Ruthenium(II) Complexes Containing P, N, and H Ligands: Structure, Spectroscopy, Electrochemistry, and Reactivity. Inorg Chem 2010; 49:9380-91. [DOI: 10.1021/ic101077t] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jinzhu Chen
- Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973-5000
| | - David J. Szalda
- Department of Natural Sciences, Baruch College, New York, New York 10010
| | - Etsuko Fujita
- Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973-5000
| | - Carol Creutz
- Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973-5000
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Sudhir VS, Baig NBR, Chandrasekaran S. Convenient Synthesis of Ferrocene Conjugates Mediated by Benzyltriethylammonium Tetrathiomolybdate in a Multi-Step Tandem Process. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900798] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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59
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Bertin PA, Meade TJ. Novel redox active bifunctional crosslinkers from unsymmetrical 1,1′-disubstituted ferrocenes. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.07.056] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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60
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Marchetti F, Pettinari C, Cerquetella A, Cingolani A, Pettinari R, Monari M, Wanke R, Kuznetsov ML, Pombeiro AJL. Switching between κ2 and κ3 Bis(pyrazol-1-yl)acetate Ligands by Tuning Reaction Conditions: Synthesis, Spectral, Electrochemical, Structural, and Theoretical Studies on Arene-Ru(II) Derivatives of Bis(azol-1-yl)acetate Ligands. Inorg Chem 2009; 48:6096-108. [DOI: 10.1021/ic900463b] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fabio Marchetti
- Dipartimento di Scienze Chimiche, Università degli Studi di Camerino, Via S. Agostino 1, 62032 Camerino MC, Italy
| | - Claudio Pettinari
- Dipartimento di Scienze Chimiche, Università degli Studi di Camerino, Via S. Agostino 1, 62032 Camerino MC, Italy
| | - Adele Cerquetella
- Dipartimento di Scienze Chimiche, Università degli Studi di Camerino, Via S. Agostino 1, 62032 Camerino MC, Italy
| | - Augusto Cingolani
- Dipartimento di Scienze Chimiche, Università degli Studi di Camerino, Via S. Agostino 1, 62032 Camerino MC, Italy
| | - Riccardo Pettinari
- Dipartimento di Scienze Chimiche, Università degli Studi di Camerino, Via S. Agostino 1, 62032 Camerino MC, Italy
| | - Magda Monari
- Dipartimento di Chimica “G. Ciamician”, Università di Bologna, Via Selmi 2, I-40126 Bologna, Italy
| | - Riccardo Wanke
- Centro de Quìmica Estrutural, Complexo I, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisbon, Portugal
| | - Maxim L. Kuznetsov
- Centro de Quìmica Estrutural, Complexo I, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisbon, Portugal
| | - Armando J. L. Pombeiro
- Centro de Quìmica Estrutural, Complexo I, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisbon, Portugal
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61
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Barry KP, Nataro C. A new synthesis and electrochemistry of 1,1′-bis(β-hydroxyethyl)ferrocene. Inorganica Chim Acta 2009. [DOI: 10.1016/j.ica.2008.09.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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62
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Wolf S, Plenio H. Synthesis of (NHC)Rh(cod)Cl and (NHC)RhCl(CO)2 complexes – Translation of the Rh- into the Ir-scale for the electronic properties of NHC ligands. J Organomet Chem 2009. [DOI: 10.1016/j.jorganchem.2008.12.047] [Citation(s) in RCA: 174] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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63
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Semenčić MČ, Siebler D, Heinze K, Rapić V. Bis- and Trisamides Derived From 1′-Aminoferrocene-1-carboxylic Acid and α-Amino Acids: Synthesis and Conformational Analysis. Organometallics 2009. [DOI: 10.1021/om801163s] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mojca Čakić Semenčić
- Department of Chemistry and Biochemistry, Faculty of Food Technology and Biotechnology, Pierottijeva 6, HR-10000 Zagreb, Croatia Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg-University of Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Daniel Siebler
- Department of Chemistry and Biochemistry, Faculty of Food Technology and Biotechnology, Pierottijeva 6, HR-10000 Zagreb, Croatia Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg-University of Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Katja Heinze
- Department of Chemistry and Biochemistry, Faculty of Food Technology and Biotechnology, Pierottijeva 6, HR-10000 Zagreb, Croatia Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg-University of Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Vladimir Rapić
- Department of Chemistry and Biochemistry, Faculty of Food Technology and Biotechnology, Pierottijeva 6, HR-10000 Zagreb, Croatia Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg-University of Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
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64
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Zekri O, Hillard EA, Top S, Vessières A, Pigeon P, Plamont MA, Huché M, Boutamine S, McGlinchey MJ, Müller-Bunz H, Jaouen G. Role of aromatic substituents on the antiproliferative effects of diphenyl ferrocenyl butene compounds. Dalton Trans 2009:4318-26. [PMID: 19662309 DOI: 10.1039/b819812h] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have been exploring the cytotoxic effects of conjugated phenylferrocene systems on breast cancer cells. Complexes with p-OH, p-NH(2), and p-NHC(O)CH(3) substitution show particularly high activity, with IC(50) values in the low or sub micromolar range for both the hormone-dependent MCF-7 and hormone-independent MDA-MB-231 breast cancer cell lines. We now present the synthesis, X-ray crystal structures and biochemical studies of analogous halogen or pseudo-halogen para-substituted compounds with R = Cl, (Z)-7a; Br, (Z)-7b; CF(3), (E)-7c; and CN, (E)-7d and (Z)-7d. Lacking hydrogen bonding groups, the compounds have low, but non-zero, relative binding affinity values for the oestrogen receptor alpha (RBA <or= 0.55%) as well as mildly exothermic ligand binding in in silico ER docking experiments. All compounds show estrogenic (proliferative) activity on the MCF-7 cell line. On MDA-MB-231 cells, the cyano complex (Z)-7d shows a reasonable cytotoxic effect (IC(50) = 11 microM), its isomer (E)-7d is only slightly cytotoxic (IC(50) = 60 microM), while the Cl, Br, and CF(3) derivatives have no effect. Cytotoxic properties, while they correlate somewhat with the resonance donating abilities of the substituent, are more strongly dependent on the presence of a proton in the functional group, supporting our prior proposition that electrophilic quinoid forms of the compounds could be active species in the cell. A correlation of the redox potential of the ferrocenyl moiety with the Hammett-Taft constants of the substituents was observed.
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Affiliation(s)
- Ouardia Zekri
- Laboratoire Charles Friedel, UMR CNRS 7223, Ecole Nationale Supérieure de Chimie de Paris, Paris, France
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65
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Casas-Solvas J, Ortiz-Salmerón E, Giménez-Martínez J, García-Fuentes L, Capitán-Vallvey L, Santoyo-González F, Vargas-Berenguel A. Ferrocene-Carbohydrate Conjugates as Electrochemical Probes for Molecular Recognition Studies. Chemistry 2009; 15:710-25. [DOI: 10.1002/chem.200800927] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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66
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Abasq ML, Saidi M, Burgot JL, Darchen A. Substituent effects of 1,2-dithiole groups on the electrochemical oxidation of some ferrocenyl-1,2-dithiole compounds. J Organomet Chem 2009. [DOI: 10.1016/j.jorganchem.2008.10.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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67
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Kalinina D, Dares C, Kaluarachchi H, Potvin PG, Lever ABP. Spectroscopic, electrochemical, and computational aspects of the charge distribution in Ru(acac)2(R-o-benzoquinonediimine) complexes. Inorg Chem 2008; 47:10110-26. [PMID: 18844345 DOI: 10.1021/ic8014496] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The syntheses and properties are reported for five Ru(acac)2(R-bqdi) species where acac is acetylacetonate, and R-bqdi is the non-innocent ligand ortho-benzoquinonediimine substituted with R = H (1), 4,5-dimethyl (2), 4-Cl (3), or 4-NO2 (4), and N,N''-dimethylsulfonyl (5). Their identities and purities were confirmed by NMR, mass spectra, IR and analytical data. The large degree of metal-to-ligand pi-back-donation was analyzed by spectroscopic (UV/visible, IR, Raman) and electrochemical data, supported by molecular orbital composition computations using density functional theory (DFT), with the polarizable continuum model (PCM) to mimic the presence of solvent, and prediction of electronic spectra using time-dependent DFT methods. Extended charge decomposition analysis (ECDA) and natural population analysis (NPA) both produced a detailed picture of the bonding between the non-innocent bqdi ligand and the metal center, allowing correlations to be drawn between the nature of the R substituents and the quantitative extent of pi-back-donation and sigma-forward donation. In conclusion, the issue of whether these species are best regarded as Ru(II)(quinonediimine) or coupled Ru(III)(semiquinonediiminate) species is discussed.
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Affiliation(s)
- Daria Kalinina
- Department of Chemistry, CB124, York University, 4700 Keele Street, Toronto, Ontario, Canada M3J 1P3
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68
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Alkyloxy- and aryloxy-titanocenes: Synthesis, solid-state structure and cyclic voltammetric studies. J Organomet Chem 2008. [DOI: 10.1016/j.jorganchem.2008.07.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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69
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Bobula T, Hudlický J, Novák P, Gyepes R, Císařová I, Štěpnička P, Kotora M. Mo-Catalyzed Cross-Metathesis Reaction of Propynylferrocene. Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200800128] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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70
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Nikolaides KR, Hoffmann SD, Eppinger J. Synthesis of substituted 1,1′-diaminoferrocenes from cyclo-2-pentene imines. J Organomet Chem 2008. [DOI: 10.1016/j.jorganchem.2007.12.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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71
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Chong D, Laws DR, Nafady A, Costa PJ, Rheingold AL, Calhorda MJ, Geiger WE. [Re(η5-C5H5)(CO)3]+ Family of 17-Electron Compounds: Monomer/Dimer Equilibria and Other Reactions. J Am Chem Soc 2008; 130:2692-703. [DOI: 10.1021/ja710513n] [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)
- Daesung Chong
- Department of Chemistry, University of Vermont, Burlington, Vermont 05405, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisboa, Portugal, and Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, California 92093
| | - Derek R. Laws
- Department of Chemistry, University of Vermont, Burlington, Vermont 05405, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisboa, Portugal, and Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, California 92093
| | - Ayman Nafady
- Department of Chemistry, University of Vermont, Burlington, Vermont 05405, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisboa, Portugal, and Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, California 92093
| | - Paulo Jorge Costa
- Department of Chemistry, University of Vermont, Burlington, Vermont 05405, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisboa, Portugal, and Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, California 92093
| | - Arnold L. Rheingold
- Department of Chemistry, University of Vermont, Burlington, Vermont 05405, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisboa, Portugal, and Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, California 92093
| | - Maria José Calhorda
- Department of Chemistry, University of Vermont, Burlington, Vermont 05405, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisboa, Portugal, and Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, California 92093
| | - William E. Geiger
- Department of Chemistry, University of Vermont, Burlington, Vermont 05405, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisboa, Portugal, and Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, California 92093
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72
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Affiliation(s)
- William E. Geiger
- Department of Chemistry, University of Vermont, Burlington, Vermont 05405
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73
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Brownie JH, Baird MC, Laws DR, Geiger WE. One-Electron Oxidations of the Methyldiphenylphosphonium Cyclopentadienylide Complexes M(η5-C5H4PMePh2)(CO)3 (M = Cr, Mo, W): Formation and Dimerization of the 17-Electron, Metal-Centered Radicals [M(η5-C5H4PMePh2)(CO)3]+. Organometallics 2007. [DOI: 10.1021/om700688p] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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74
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Oligonuclear Amide-bridged Ferrocenes fromN-Fmoc Protected 1-Amino-1′-fluorocarbonyl Ferrocene. Z Anorg Allg Chem 2007. [DOI: 10.1002/zaac.200700157] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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75
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Novikova OV, Kuznetsova OV, Egorochkin AN. Electrochemical oxidation of organic, organometallic, and coordination compounds. Polarization effect in radical cations. RUSS J GEN CHEM+ 2007. [DOI: 10.1134/s1070363207090174] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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76
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Pombeiro AJL. Characterization of Coordination Compounds by Electrochemical Parameters. Eur J Inorg Chem 2007. [DOI: 10.1002/ejic.200601095] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Armando J. L. Pombeiro
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, Av. Rovisco Pais, 1049‐001 Lisboa, Portugal
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77
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78
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Hagopian LE, Campbell AN, Golen JA, Rheingold AL, Nataro C. Synthesis and electrochemistry of late transition metal complexes containing 1,1′-bis(dicyclohexylphosphino)ferrocene (dcpf). The X-ray structure of [PdCl2(dcpf)] and Buchwald–Hartwig catalysis using [PdCl2(bisphosphinometallocene)] precursors. J Organomet Chem 2006. [DOI: 10.1016/j.jorganchem.2006.08.030] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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79
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Blanco FN, Hagopian LE, McNamara WR, Golen JA, Rheingold AL, Nataro C. Anodic Electrochemistry of Free and Coordinated 1,1‘-Bis(di-tert-butylphosphino)ferrocene. Organometallics 2006. [DOI: 10.1021/om051011+] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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80
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Martinak SL, Sites LA, Kolb SJ, Bocage KM, McNamara WR, Rheingold AL, Golen JA, Nataro C. Derivatives of 1,1′-bis(diphenylphosphino)ferrocene (dppf): Electrochemistry, complexation and the X-ray structures of 1,1′-bis(diphenylphosphino)osmocene (dppo) and [PdCl2(dppo)]. J Organomet Chem 2006. [DOI: 10.1016/j.jorganchem.2006.05.012] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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81
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Weinstein JA, Tierney MT, Davies ES, Base K, Robeiro AA, Grinstaff MW. Probing the Electronic Structure of Platinum(II) Chromophores: Crystal Structures, NMR Structures, and Photophysical Properties of Six New Bis- and Di- Phenolate/Thiolate Pt(II)Diimine Chromophores. Inorg Chem 2006; 45:4544-55. [PMID: 16711705 DOI: 10.1021/ic051733t] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A general route for synthesis of six structurally similar Pt(II) diimine thiolate/phenolates chromophores possessing bulky phenolate or thiolate ligands is reported. The Pt chromophores were characterized using an array of techniques including 1H, 13C, and 195Pt NMR, absorption, emission, (spectro)electrochemistry, and EPR spectroscopy. Systematic variation of the electronic structure of the Pt(II) chromophores studied was achieved by (i) changing solvent polarity; (ii) substituting oxygen for sulfur in the donor ligand; (iii) alternating donor ligands from bis- to di-coordination; and (iv) changing the electron donating/withdrawing properties of the ligand(s). The lowest excited state in these new chromophores was assigned to a [charge-transfer-to-diimine] transition from the HOMO of mixed Pt/S (or Pt/O) character on the basis of absorption and emission spectroscopy, UV/vis (spectro)electrochemistry, and EPR spectroscopy. One of the chromophores, Pt(dpphen)(3,5-di-tert-butyl-catecholate) represents an example of a Pt(II) diimine phenolate chromophore that possesses a reversible oxidation centered predominantly on the donor ligand. Results from EPR spectroscopy indicate participation of the Pt(II) orbitals in the HOMO. There is a dramatic difference in the photophysical properties of carborane complexes compared to other mixed-ligand Pt(II) compounds, which includes room-temperature emission and photostability. The charge-transfer character of the lowest excited state in this series of chromophores is maintained throughout. Moreover, the absorption and emission energies and the redox properties of the excited state can be significantly tuned.
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Affiliation(s)
- Julia A Weinstein
- Department of Chemistry, University of Sheffield, Sheffield S3 7HF, United Kingdom.
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82
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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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83
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Chong D, Nafady A, Costa PJ, Calhorda MJ, Geiger WE. Anodic Preparation of [Re2Cp2(CO)6]2+: A Dimeric Dication that Provides the Powerful One-Electron Oxidant [ReCp(CO)3]+. J Am Chem Soc 2005; 127:15676-7. [PMID: 16277489 DOI: 10.1021/ja055045k] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The half-sandwich piano-stool compounds Re(eta5-C5R5)(CO)3 (1, R = H; or 2, R = Me) are oxidized to the corresponding 17-electron Re(II) cations at glassy carbon anodes in CH2Cl2/[NBu4][B(C6F5)4]. Despite the very strongly positive E1/2 values of the couples (1.16 V for 1/1+ and 0.91 V for 2/2+ vs ferrocene/ferrocenium), the radical cations are persistent in this medium and exist in equilibrium with the corresponding dimeric dications, which may be cathodically reduced back to the neutral starting material. DFT calculations show that the dimer of 1+ achieves its stability through formation of a single long (almost 3.3 A) Re-Re bond made possible when the HOMO in 1 is rehybridized away from the metal in the one-electron oxidation process. The pure salts [1][B(C6F5)4]2 and [2][B(C6F5)4]2 were isolated by preparative anodic electrochemistry. The former may be used for storage of the very strong one-electron oxidant 1+, which was used to prepare a number of oxidation products as their [B(C6F5)4]- salts.
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Affiliation(s)
- Daesung Chong
- Department of Chemistry, University of Vermont, Burlington, Vermont 05405, USA
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84
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Okamura TA, Sakauye K, Doi M, Yamamoto H, Ueyama N, Nakamura A. Observation of a Large Current on the Cyclic Voltammetry of Acylaminoferrocenes in the Solid State: An Efficient Electron-Transfer Pathway through Continuous NH···O=C Hydrogen-Bond Chains and π-Conjugation. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2005. [DOI: 10.1246/bcsj.78.1270] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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85
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Vogler A, Kunkely H. Excited state properties of organometallics based on interligand interactions between aromatic ligands. Coord Chem Rev 2005. [DOI: 10.1016/j.ccr.2005.03.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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86
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Swartz BD, Nataro C. Anodic Electrochemistry of Ferrocenylphosphine and Ruthenocenylphosphine Chalcogenide Complexes and Lewis Acid Adducts. Organometallics 2005. [DOI: 10.1021/om050074p] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Brett D. Swartz
- Department of Chemistry, Lafayette College, Easton, Pennsylvania 18042
| | - Chip Nataro
- Department of Chemistry, Lafayette College, Easton, Pennsylvania 18042
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87
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Campbell AN, Kolb SJ, Barrios-Landeros F, Nataro C. Electrochemistry of di-tert-butylphosphinopentaphenylferrocene (Q-phos) and derivatives. Electrochim Acta 2005. [DOI: 10.1016/j.electacta.2004.11.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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88
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Paolucci D, Marcaccio M, Bruno C, Braga D, Polito M, Paolucci F, Grepioni F. Ferrocenyl-Based π-Conjugated Complexes: Modulation of Electronic Properties by Symmetric/Asymmetric Cyclopentadienyl Substitution. Organometallics 2005. [DOI: 10.1021/om049212l] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Demis Paolucci
- Dipartimento di Chimica “G. Ciamician”, Università degli Studi di Bologna, Via Selmi 2, 40126 Bologna, Italy
| | - Massimo Marcaccio
- Dipartimento di Chimica “G. Ciamician”, Università degli Studi di Bologna, Via Selmi 2, 40126 Bologna, Italy
| | - Carlo Bruno
- Dipartimento di Chimica “G. Ciamician”, Università degli Studi di Bologna, Via Selmi 2, 40126 Bologna, Italy
| | - Dario Braga
- Dipartimento di Chimica “G. Ciamician”, Università degli Studi di Bologna, Via Selmi 2, 40126 Bologna, Italy
| | - Marco Polito
- Dipartimento di Chimica “G. Ciamician”, Università degli Studi di Bologna, Via Selmi 2, 40126 Bologna, Italy
| | - Francesco Paolucci
- Dipartimento di Chimica “G. Ciamician”, Università degli Studi di Bologna, Via Selmi 2, 40126 Bologna, Italy
| | - Fabrizia Grepioni
- Dipartimento di Chimica, Università di Sassari, Via Vienna 2, 07100 Sassari, Italy
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89
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Heinze K, Schlenker M. Main Chain Ferrocenyl Amides from 1-Aminoferrocene-1′-carboxylic Acid. Eur J Inorg Chem 2004. [DOI: 10.1002/ejic.200300897] [Citation(s) in RCA: 101] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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90
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Ligand-to-ligand charge transfer in [(η-C 5 Me 5 )Rh III (η-C 7 H 7 )] 3+ : absorption and emission. INORG CHEM COMMUN 2004. [DOI: 10.1016/j.inoche.2004.02.032] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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91
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Ong JHL, Nataro C, Golen JA, Rheingold AL. Electrochemistry of Late Transition Metal Complexes Containing the Ligand 1,1‘-Bis(diisopropylphosphino)ferrocene (dippf). Organometallics 2003. [DOI: 10.1021/om0340138] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Joyce H. L. Ong
- Department of Chemistry, Lafayette College, Easton, Pennsylvania 18042, and Department of Chemistry & Biochemistry, University of Delaware, Newark, Delaware 19716
| | - Chip Nataro
- Department of Chemistry, Lafayette College, Easton, Pennsylvania 18042, and Department of Chemistry & Biochemistry, University of Delaware, Newark, Delaware 19716
| | - James A. Golen
- Department of Chemistry, Lafayette College, Easton, Pennsylvania 18042, and Department of Chemistry & Biochemistry, University of Delaware, Newark, Delaware 19716
| | - Arnold L. Rheingold
- Department of Chemistry, Lafayette College, Easton, Pennsylvania 18042, and Department of Chemistry & Biochemistry, University of Delaware, Newark, Delaware 19716
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92
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The effect of bipyridine modifications on the electrochemical and electronic properties of Ru(II)–bipyridine carbonyls. J Electroanal Chem (Lausanne) 2003. [DOI: 10.1016/s0022-0728(03)00335-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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93
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Debroy P, Roy S. Synthesis of ferrocenes with ene-terminus via water-promoted Barbier-like carbonyl allylation using bimetallic copper(II)/tin(II) reagent. J Organomet Chem 2003. [DOI: 10.1016/s0022-328x(03)00205-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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94
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Group 10 metal compounds of 1,1′-bis(diphenylphosphino)ferrocene (dppf) and 1,1′-bis(diphenylphosphino)ruthenocene: a structural and electrochemical investigation. X-ray structures of [MCl2(dppr)] (M=Ni, Pd). J Organomet Chem 2003. [DOI: 10.1016/s0022-328x(03)00155-4] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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95
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Lindner E, Ayasse CS, Eichele K, Steimann M. Macrocyclic Di- and Tetranuclear Osmacycloferrocenophanes,1. Organometallics 2002. [DOI: 10.1021/om020310l] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ekkehard Lindner
- Universität Tübingen, Institut für Anorganische Chemie, Auf der Morgenstelle 18, 72076 Tübingen, Germany
| | - Christoph S. Ayasse
- Universität Tübingen, Institut für Anorganische Chemie, Auf der Morgenstelle 18, 72076 Tübingen, Germany
| | - Klaus Eichele
- Universität Tübingen, Institut für Anorganische Chemie, Auf der Morgenstelle 18, 72076 Tübingen, Germany
| | - Manfred Steimann
- Universität Tübingen, Institut für Anorganische Chemie, Auf der Morgenstelle 18, 72076 Tübingen, Germany
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96
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Field LD, He T, Masters AF, Turner P. The synthesis and X-ray structural characterisation of the decaphenylmolybdenocenium cation as its tetrafluoroborate salt. Polyhedron 2002. [DOI: 10.1016/s0277-5387(02)00978-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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97
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Seneviratne DS, Uddin J, Swayambunathan V, Schlegel HB, Endicott JF. Characteristics and properties of metal-to-ligand charge-transfer excited states in 2,3-bis(2-pyridyl)pyrazine and 2,2'-bypyridine ruthenium complexes. Perturbation-theory-based correlations of optical absorption and emission parameters with electrochemistry and thermal kinetics and related Ab initio calculations. Inorg Chem 2002; 41:1502-17. [PMID: 11896719 DOI: 10.1021/ic010172c] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
The absorption, emission, and infrared spectra, metal (Ru) and ligand (PP) half-wave potentials, and ab initio calculations on the ligands (PP) are compared for several [L(n)()Ru(PP)](2+) and [[L(n)Ru]dpp[RuL'(n)]](4+) complexes, where L(n) and L'(n) = (bpy)(2) or (NH(3))(4) and PP = 2,2'-bipyridine (bpy), 2,3-bis(2-pyridyl)pyrazine (dpp), 2,3-bis(2-pyridyl)quinoxaline (dpq), or 2,3-bis(2pyridyl)benzoquinoxaline (dpb). The energy of the metal-to-ligand charge-transfer (MLCT) absorption maximum (hnu(max)) varies in nearly direct proportion to the difference between Ru(III)/Ru(II) and (PP)/(PP)(-) half-wave potentials, DeltaE(1/2), for the monometallic complexes but not for the bimetallic complexes. The MLCT spectra of [(NH(3))(4)Ru(dpp)](2+) exhibit three prominent visible-near-UV absorptions, compared to two for [(NH(3))(4)Ru(bpy)](2+), and are not easily reconciled with the MLCT spectra of [[(NH(3))(4)Ru]dpp[RuL(n)]](4+). The ab initio calculations indicate that the two lowest energy pi orbitals are not much different in energy in the PP ligands (they correlate with the degenerate pi orbitals of benzene) and that both contribute to the observed MLCT transitions. The LUMO energies calculated for the monometallic complexes correlate strongly with the observed hnu(max) (corrected for variations in metal contribution). The LUMO computed for dpp correlates with LUMO + 1 of pyrazine. This inversion of the order of the two lowest energy pi orbitals is unique to dpp in this series of ligands. Configurational mixing of the ground and MLCT excited states is treated as a small perturbation of the overall energies of the metal complexes, resulting in a contribution epsilon(s) to the ground-state energy. The fraction of charge delocalized, alpha(DA)(2), is expected to attenuate the reorganizational energy, chi(reorg), by a factor of approximately (1 - 4alpha(DA)(2) + alpha(DA)(4)), relative to the limit where there is no charge delocalization. This appears to be a substantial effect for these complexes (alpha(DA)(2) congruent with 0.1 for Ru(II)/bpy), and it leads to smaller reorganizational energies for emission than for absorption. Reorganizational energies are inferred from the bandwidths found in Gaussian analyses of the emission and/or absorption spectra. Exchange energies are estimated from the Stokes shifts combined with perturbation--theory-based relationship between the reorganizational energies for absorption and emission values. The results indicate that epsilon(s) is dominated by terms that contribute to electron delocalization between metal and PP ligand. This inference is supported by the large shifts in the N-H stretching frequency of coordinated NH(3) as the number of PP ligands is increased. The measured properties of the bpy and dpp ligands seem to be very similar, but electron delocalization appears to be slightly larger (10-40%) and the exchange energy contributions appear to be comparable (e.g., approximately 1.7 x 10(3) cm(-1) in [Ru(bpy)(2)dpp](2+) compared to approximately 1.3 x 10(3) cm(-1) in the bpy analogue).
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98
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Štěpnička P, Trojan L, Kubišta J, Ludvı́k J. Internal ferrocenylalkynes—a comparative electrochemical and mass spectrometric study. J Organomet Chem 2001. [DOI: 10.1016/s0022-328x(01)00922-6] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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99
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Perrin L, Clot E, Eisenstein O, Loch J, Crabtree RH. Computed ligand electronic parameters from quantum chemistry and their relation to Tolman parameters, Lever parameters, and Hammett constants. Inorg Chem 2001; 40:5806-11. [PMID: 11681889 DOI: 10.1021/ic0105258] [Citation(s) in RCA: 207] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The calculated (DFT, B3PW91) A(1) nu(CO) frequency in LNi(CO)(3) defines an electronic parameter that reliably predicts the relative donor powers of a wide variety of cationic, neutral, and negatively charged ligands. These calculated parameters correlate very well with the available Tolman and Lever parameters, and also with Hammett's sigma(m), where available. The method avoids any experimental limitations and, in particular, can be used for proposed ligands not yet experimentally available.
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Affiliation(s)
- L Perrin
- Laboratoire de Structure et Dynamique des Systèmes Moléculaires et Solides, UMR 5636 (CNRS), Université de Montpellier 2, 34095 Montpellier Cedex 5, France
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