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Bussoli G, Cesari C, Femoni C, Carmela Iapalucci M, Ruggieri S, Tiozzo C, Zacchini S. Atomically precise rhodium nanoclusters: synthesis and characterization of the heterometallic [Rh18Sn3Cl2(CO)33]4− and [Rh7Sn4Cl10(CO)14]5− carbonyl compounds. Results in Chemistry 2022. [DOI: 10.1016/j.rechem.2022.100435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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2
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Jouve A, Nagy G, Somodi F, Tiozzo C, Villa A, Balerna A, Beck A, Evangelisti C, Prati L. Gold-silver catalysts: Effect of catalyst structure on the selectivity of glycerol oxidation. J Catal 2018. [DOI: 10.1016/j.jcat.2018.10.019] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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3
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Evangelisti C, Guidotti M, Tiozzo C, Psaro R, Maksimchuk N, Ivanchikova I, Shmakov AN, Kholdeeva O. Titanium-silica catalyst derived from defined metallic titanium cluster precursor: Synthesis and catalytic properties in selective oxidations. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.06.059] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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4
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Costenaro D, Bisio C, Carniato F, Katsev AM, Safronyuk SL, Starodub N, Tiozzo C, Guidotti M. Tungsten oxide: a catalyst worth studying for the abatement and decontamination of chemical warfare agents. Global Security: Health, Science and Policy 2017. [DOI: 10.1080/23779497.2017.1330662] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Affiliation(s)
- Daniele Costenaro
- Nano-SiSTeMI Interdisciplinary Centre, University of Eastern Piedmont, Alessandria, Italy
| | - Chiara Bisio
- Nano-SiSTeMI Interdisciplinary Centre, University of Eastern Piedmont, Alessandria, Italy
- CNR – Institute of Molecular Sciences and Technology, Milano, Italy
| | - Fabio Carniato
- Nano-SiSTeMI Interdisciplinary Centre, University of Eastern Piedmont, Alessandria, Italy
| | - Andrey M. Katsev
- Medical Academy, V.I. Vernadsky Crimean Federal University, Simferopol, Crimea
| | - Sergey L. Safronyuk
- Medical Academy, V.I. Vernadsky Crimean Federal University, Simferopol, Crimea
| | - Nickolaj Starodub
- National University of Life and Environmental Sciences, Kyiv, Ukraine
| | - Cristina Tiozzo
- CNR – Institute of Molecular Sciences and Technology, Milano, Italy
| | - Matteo Guidotti
- CNR – Institute of Molecular Sciences and Technology, Milano, Italy
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Affiliation(s)
- Werner Oberhauser
- Istituto di Chimica
dei Composti Organometallici (CNR-ICCOM), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
| | - Claudio Evangelisti
- Istituto di Scienze
e Tecnologie Molecolari (CNR-ISTM), Via Fantoli 16/15, 20138 Milano, Italy
| | - Cristina Tiozzo
- Istituto di Scienze
e Tecnologie Molecolari (CNR-ISTM), Via Fantoli 16/15, 20138 Milano, Italy
| | - Francesco Vizza
- Istituto di Chimica
dei Composti Organometallici (CNR-ICCOM), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
| | - Rinaldo Psaro
- Istituto di Scienze
e Tecnologie Molecolari (CNR-ISTM), Via Fantoli 16/15, 20138 Milano, Italy
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6
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Palumbo C, Tiozzo C, Ravasio N, Psaro R, Carniato F, Bisio C, Guidotti M. An efficient epoxidation of terminal aliphatic alkenes over heterogeneous catalysts: when solvent matters. Catal Sci Technol 2016. [DOI: 10.1039/c5cy01639h] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
With a peculiar combination of catalyst/oxidant/solvent, it is possible to obtain good yields and excellent selectivities in the epoxidation of 1-octene.
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Affiliation(s)
- C. Palumbo
- CNR-Istituto di Scienze e Tecnologie Molecolari
- Via C. Golgi 19
- 20133 Milano
- Italy
| | - C. Tiozzo
- CNR-Istituto di Scienze e Tecnologie Molecolari
- Via C. Golgi 19
- 20133 Milano
- Italy
| | - N. Ravasio
- CNR-Istituto di Scienze e Tecnologie Molecolari
- Via C. Golgi 19
- 20133 Milano
- Italy
| | - R. Psaro
- CNR-Istituto di Scienze e Tecnologie Molecolari
- Via C. Golgi 19
- 20133 Milano
- Italy
| | - F. Carniato
- Dipartimento di Scienze e Innovazione Tecnologica and Nano-SISTEMI Interdisciplinary Centre
- Università del Piemonte Orientale “A. Avogadro”
- 15121 Alessandria
- Italy
| | - C. Bisio
- CNR-Istituto di Scienze e Tecnologie Molecolari
- Via C. Golgi 19
- 20133 Milano
- Italy
- Dipartimento di Scienze e Innovazione Tecnologica and Nano-SISTEMI Interdisciplinary Centre
| | - M. Guidotti
- CNR-Istituto di Scienze e Tecnologie Molecolari
- Via C. Golgi 19
- 20133 Milano
- Italy
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7
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Tiozzo C, Bisio C, Carniato F, Guidotti M. Grafted non-ordered niobium-silica materials: Versatile catalysts for the selective epoxidation of various unsaturated fine chemicals. Catal Today 2014. [DOI: 10.1016/j.cattod.2014.02.027] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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8
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Carniti P, Gervasini A, Tiozzo C, Guidotti M. Niobium-Containing Hydroxyapatites as Amphoteric Catalysts: Synthesis, Properties, and Activity. ACS Catal 2014. [DOI: 10.1021/cs4010453] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Paolo Carniti
- Dipartimento
di Chimica, Università degli Studi di Milano, via Camillo
Golgi, 19, I-20133 Milano, Italy
| | - Antonella Gervasini
- Dipartimento
di Chimica, Università degli Studi di Milano, via Camillo
Golgi, 19, I-20133 Milano, Italy
- CIMaINa, Università degli Studi di Milano, via Celoria 16, I-20133 Milano, Italy
| | - Cristina Tiozzo
- CNR-Istituto di Scienze e Tecnologie Molecolari, via Camillo Golgi 19, I-20133 Milano, Italy
| | - Matteo Guidotti
- CNR-Istituto di Scienze e Tecnologie Molecolari, via Camillo Golgi 19, I-20133 Milano, Italy
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9
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Gallo A, Tiozzo C, Psaro R, Carniato F, Guidotti M. Niobium metallocenes deposited onto mesoporous silica via dry impregnation as catalysts for selective epoxidation of alkenes. J Catal 2013. [DOI: 10.1016/j.jcat.2012.11.015] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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10
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Tiozzo C, Bisio C, Carniato F, Gallo A, Scott SL, Psaro R, Guidotti M. Niobium–silica catalysts for the selective epoxidation of cyclic alkenes: the generation of the active site by grafting niobocene dichloride. Phys Chem Chem Phys 2013; 15:13354-62. [DOI: 10.1039/c3cp51570b] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Tiozzo C, Bisio C, Carniato F, Marchese L, Gallo A, Ravasio N, Psaro R, Guidotti M. Epoxidation with hydrogen peroxide of unsaturated fatty acid methyl esters over Nb(V)-silica catalysts. EUR J LIPID SCI TECH 2012. [DOI: 10.1002/ejlt.201200217] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Dolzhnikov DS, Iapalucci MC, Longoni G, Tiozzo C, Zacchini S, Femoni C. New High-Nuclearity Carbonyl and Carbonyl-Substituted Rhodium Clusters and Their Relationships with Polyicosahedral Carbonyl-Substituted Palladium- and Gold-Thiolates. Inorg Chem 2012; 51:11214-6. [DOI: 10.1021/ic3011508] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dmitriy S. Dolzhnikov
- Dipartimento di Chimica Fisica ed
Inorganica, Università
di Bologna, Viale Risorgimento 4, 40136 Bologna, Italy
| | - Maria C. Iapalucci
- Dipartimento di Chimica Fisica ed
Inorganica, Università
di Bologna, Viale Risorgimento 4, 40136 Bologna, Italy
| | - Giuliano Longoni
- Dipartimento di Chimica Fisica ed
Inorganica, Università
di Bologna, Viale Risorgimento 4, 40136 Bologna, Italy
| | - Cristina Tiozzo
- Dipartimento di Chimica Fisica ed
Inorganica, Università
di Bologna, Viale Risorgimento 4, 40136 Bologna, Italy
| | - Stefano Zacchini
- Dipartimento di Chimica Fisica ed
Inorganica, Università
di Bologna, Viale Risorgimento 4, 40136 Bologna, Italy
| | - Cristina Femoni
- Dipartimento di Chimica Fisica ed
Inorganica, Università
di Bologna, Viale Risorgimento 4, 40136 Bologna, Italy
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13
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Chao CM, Tiozzo C, Al Alam D, Bellusci S. Fgf10 overexpression prevents lung injury in a BPD model. Pneumologie 2012. [DOI: 10.1055/s-0032-1315554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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14
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Collini D, Fabrizi De Biani F, Dolzhnikov DS, Femoni C, Iapalucci MC, Longoni G, Tiozzo C, Zacchini S, Zanello P. Synthesis, Structure, and Spectroscopic Characterization of [H8−nRh22(CO)35]n−(n= 4, 5) and [H2Rh13(CO)24{Cu(MeCN)}2]−Clusters: Assessment of CV and DPV As Techniques to Circumstantiate the Presence of Elusive Hydride Atoms. Inorg Chem 2011; 50:2790-8. [DOI: 10.1021/ic101872z] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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Lopez-Acevedo O, Rintala J, Virtanen S, Femoni C, Tiozzo C, Grönbeck H, Pettersson M, Häkkinen H. Characterization of Iron−Carbonyl-Protected Gold Clusters. J Am Chem Soc 2009; 131:12573-5. [DOI: 10.1021/ja905182g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Olga Lopez-Acevedo
- Departments of Physics, Chemistry, Nanoscience Center, University of Jyväskylä, FI-40014 Jyväskylä, Finland, Dipartimento di Chimica Fisica ed Inorganica, Universita di Bologna, 40136 Bologna, Italy, and Department of Applied Physics and Competence Center for Catalysis, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - Jyri Rintala
- Departments of Physics, Chemistry, Nanoscience Center, University of Jyväskylä, FI-40014 Jyväskylä, Finland, Dipartimento di Chimica Fisica ed Inorganica, Universita di Bologna, 40136 Bologna, Italy, and Department of Applied Physics and Competence Center for Catalysis, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - Suvi Virtanen
- Departments of Physics, Chemistry, Nanoscience Center, University of Jyväskylä, FI-40014 Jyväskylä, Finland, Dipartimento di Chimica Fisica ed Inorganica, Universita di Bologna, 40136 Bologna, Italy, and Department of Applied Physics and Competence Center for Catalysis, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - Cristina Femoni
- Departments of Physics, Chemistry, Nanoscience Center, University of Jyväskylä, FI-40014 Jyväskylä, Finland, Dipartimento di Chimica Fisica ed Inorganica, Universita di Bologna, 40136 Bologna, Italy, and Department of Applied Physics and Competence Center for Catalysis, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - Cristina Tiozzo
- Departments of Physics, Chemistry, Nanoscience Center, University of Jyväskylä, FI-40014 Jyväskylä, Finland, Dipartimento di Chimica Fisica ed Inorganica, Universita di Bologna, 40136 Bologna, Italy, and Department of Applied Physics and Competence Center for Catalysis, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - Henrik Grönbeck
- Departments of Physics, Chemistry, Nanoscience Center, University of Jyväskylä, FI-40014 Jyväskylä, Finland, Dipartimento di Chimica Fisica ed Inorganica, Universita di Bologna, 40136 Bologna, Italy, and Department of Applied Physics and Competence Center for Catalysis, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - Mika Pettersson
- Departments of Physics, Chemistry, Nanoscience Center, University of Jyväskylä, FI-40014 Jyväskylä, Finland, Dipartimento di Chimica Fisica ed Inorganica, Universita di Bologna, 40136 Bologna, Italy, and Department of Applied Physics and Competence Center for Catalysis, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - Hannu Häkkinen
- Departments of Physics, Chemistry, Nanoscience Center, University of Jyväskylä, FI-40014 Jyväskylä, Finland, Dipartimento di Chimica Fisica ed Inorganica, Universita di Bologna, 40136 Bologna, Italy, and Department of Applied Physics and Competence Center for Catalysis, Chalmers University of Technology, SE-41296 Göteborg, Sweden
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Femoni C, Iapalucci MC, Longoni G, Tiozzo C, Zacchini S, Heaton BT, Iggo JA, Zanello P, Fedi S, Garland MV, Li C. The loss of CO from [Rh12(μ12-Sn)(CO)27]4−: Synthesis, spectroscopic and structural characterization of the electron-deficient, icosahedral [Rh12(μ12-Sn)(CO)25]4− and [Rh12(μ12-Sn)(CO)26]4− tetra-anions. Dalton Trans 2009:2217-23. [DOI: 10.1039/b818944g] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Albonetti S, Bonelli R, Epoupa Mengou J, Femoni C, Tiozzo C, Zacchini S, Trifirò F. Gold/iron carbonyl clusters as precursors for TiO2 supported catalysts. Catal Today 2008. [DOI: 10.1016/j.cattod.2007.11.003] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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18
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Femoni C, Iapalucci M, Longoni G, Tiozzo C, Zacchini S. An Organometallic Approach to Gold Nanoparticles: Synthesis and X-Ray Structure of CO-Protected Au21Fe10, Au22Fe12, Au28Fe14, and Au34Fe14Clusters. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200802267] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Femoni C, Iapalucci M, Longoni G, Tiozzo C, Zacchini S. An Organometallic Approach to Gold Nanoparticles: Synthesis and X-Ray Structure of CO-Protected Au21Fe10, Au22Fe12, Au28Fe14, and Au34Fe14Clusters. Angew Chem Int Ed Engl 2008; 47:6666-9. [DOI: 10.1002/anie.200802267] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Femoni C, Iapalucci MC, Longoni G, Tiozzo C, Wolowska J, Zacchini S, Zazzaroni E. New hybrid semiconductor materials based on viologen salts of bimetallic Fe-Pt and Fe-Au carbonyl clusters: first structural characterization of the diradical pi-dimer of the diethylviologen monocation and EPR evidence of its triplet state. Chemistry 2007; 13:6544-54. [PMID: 17614305 DOI: 10.1002/chem.200700398] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The synthesis, structure, spectroscopic characterization and electrical resistivity of the [EtV](2)[Fe(4)Pt(CO)(16)], [EtV][Fe(3)Pt(3)(CO)(15)].THF, [EtV][Fe(4)Au(CO)(16)](2)2.THF (EtV=1,1'-diethyl-4,4'-bipyridilium cation) and [NEt(4)](2)[Fe(4)Au(CO)(16)] is reported. The crystal structure of [EtV](2)[Fe(4)Pt(CO)(16)] is based on infinite stacks of [(EtV)(*+)](2) pi-dimers rotated by 90 degrees and isolated [Fe(4)Pt(CO)(16)](2-) ions. Within each pi-dimer, the [EtV](*+) radical ions are perfectly eclipsed and the distance between their mean planes is 3.275 A. The EPR spectrum of the solid material at room temperature clearly indicates the presence of a significantly populated triplet state of the pi-dimer, by showing signals both at Deltam=1 and Deltam=2. The solid-state structure of [EtV][Fe(3)Pt(3)(CO)(15)].THF is based on the ionic packing of [EtV](2+) and [Fe(3)Pt(3)(CO)(15)](2-) ions, inferred from a comparison of their molecular parameters with literature data. Significant electron transfer could have been expected to give [EtV](*+)[Fe(3)Pt(3)(CO)(15)](*-) on the basis of their formal redox potentials. In spite of their different stoichiometries, the structures of [EtV][Fe(4)Au(CO)(16)](2).2 THF and [NEt(4)](2)[Fe(4)Au(CO)(16)] both contain an isomer of the monoanion [Fe(4)Au(CO)(16)](-) in solution (previously characterized in the solid state as a [NMe(3)CH(2)Ph](2)[Fe(4)Au(CO)(16)]Cl mixed salt). Resistivity measurements on pellets of powdered samples of the above compounds indicate that their tetrasubstituted ammonium salts, and complex [EtV][Fe(4)Au(CO)(16)](2)2.THF, largely behave as insulators. However, the [EtV](2)[Fe(4)Pt(CO)(16)] and [EtV][Fe(3)Pt(3)(CO)(15)].THF samples respectively display resistivities 3 and 4 orders of magnitude less than those of their corresponding ammonium salts and could be classified as semiconductor materials.
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Affiliation(s)
- Cristina Femoni
- Dipartimento di Chimica Fisica e Inorganica, Università di Bologna, Viale Risorgimento, 4-40136 Bologna, Italy
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Collini D, Biani FFD, Fedi S, Femoni C, Kaswalder F, Iapalucci MC, Longoni G, Tiozzo C, Zacchini S, Zanello P. Synthesis and Electrochemistry of New Rh-Centered and Conjuncto Rhodium Carbonyl Clusters. X-ray Structure of [NEt4]3[Rh15(CO)27], [NEt4]3[Rh15(CO)25(MeCN)2]·2MeCN, and [NEt4]3[Rh17(CO)37]. Inorg Chem 2007; 46:7971-81. [PMID: 17705365 DOI: 10.1021/ic0623718] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A reinvestigation of the redox chemistry of [Rh7(CO)16]3- resulted in the finding of new alternative syntheses for a series of previously reported Rh-centered carbonyl clusters, i.e., [H4-nRh14(CO)25]n- (n = 3 and 4) and [Rh17(CO)30]3-, as well as new species such as a different isomer of [Rh15(CO)27]3-, the carbonyl-substituted [Rh15(CO)25(MeCN)2]3-, and the conjuncto [Rh17(CO)37]3- clusters. All of the above clusters are suggested to derive from oxidation of [Rh7(CO)16]3- with H+, arising from dissociation either of [M(H2O)n]2+ aquo complexes or nonoxidizing acids. The nature of the previously reported species has been confirmed by IR, electrospray ionization mass spectrometry, and complete X-ray diffraction studies. Only the molecular structures of the new clusters are reported in some details. The ready conversion of [Rh7(CO)16]3- in [HRh14(CO)25]3- upon oxidation has been confirmed by electrochemical techniques. In addition, electrochemical studies point out that the close-packed [H3Rh13(CO)24]2- dianion undergoes a reversible monoelectronic reduction followed by an irreversible reduction. The irreversibility of the second reduction is probably a consequence of H2 elimination from a purported [H3Rh13(CO)24]4- species. Conversely, the body-centered-cubic [HRh14(CO)25]3- and [Rh15(CO)27]3- trianions display several well-defined redox changes with features of electrochemical reversibility, even at low scan rate. The major conclusion of this work is that mild experimental conditions and a tailored oxidizing reagent may enable more selective conversion of [Rh7(CO)16]3- into a higher-nuclearity rhodium carbonyl cluster. It is also shown that isonuclear Rh clusters may display isomeric metal frameworks [i.e., [Rh15(CO)27]3-], as well as almost identical metal frames stabilized by a different number of carbonyl groups [i.e., [Rh15(CO)27]3- and [Rh15(CO)30]3-]. Other isonuclear Rh clusters stabilized by a different number of CO ligands more expectedly exhibit completely different metal geometries [i.e., [Rh17(CO)30]3- and [Rh17(CO)37]3-]. The first pair of isonuclear and isoskeletal clusters is particularly astonishing in that [Rh15(CO)30]3- features six valence electrons more than [Rh15(CO)27]3-. Finally, the electrochemical studies seem to suggest that interstitial Rh atoms are less effective than Ni and Pt interstitial atoms in promoting redox properties and inducing molecular capacitor behavior in carbonyl clusters.
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Affiliation(s)
- Davide Collini
- Dipartimento di Chimica Fisica ed Inorganica, Università di Bologna, viale Risorgimento 4, 40136 Bologna, Italy
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Femoni C, Iapalucci MC, Longoni G, Tiozzo C, Zacchini S, Heaton BT, Iggo JA. Sn-centred icosahedral Rh carbonyl clusters: synthesis and structural characterization and 13C–{103Rh} HMQC NMR studies. Dalton Trans 2007:3914-23. [PMID: 17893789 DOI: 10.1039/b708469b] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of [Rh7(CO)16]3- with SnCl(2).2H2O in a 1 : 1 molar ratio under N2 results in the formation of the new heterometallic cluster, [Rh12Sn(CO)27]4-, in very high yield (ca. 86%). Further controlled additions of SnCl(2).2H2O, or solutions of HCl, or [RhCl(COD)]2, give [Rh12(mu-Cl)2Sn(CO)23]4-. Similarly, addition of HBr to [Rh12Sn(CO)27]4- gives the related cluster [Rh12(mu-Br)2Sn(CO)23]4-. Notably, if the addition of SnCl(2).2H2O to [Rh12Sn(CO)27]4- is carried out under a CO atmosphere, the reaction takes a different course and leads to the formation of the new cluster, [Rh12Sn(mu3-RhCl)(CO)27]4-. All the above clusters have been shown by single-crystal X-ray diffraction studies to have a metal framework based on an icosahedron, which is centred by the unique Sn atom. Their chemical reactivity and 13C-{103Rh} HMQC NMR spectroscopic characterization are also reported.
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Affiliation(s)
- Cristina Femoni
- Dipartimento di Chimica Fisica ed Inorganica, Università di Bologna, viale Risorgimento 4, 40136 Bologna, Italy
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Gentilucci L, Cardillo G, Tolomelli A, Squassabia F, Tiozzo C. A novel family of minimal PMRI cyclic peptides as versatile scaffolds for generating new molecular topology. Med Chem 2006; 2:395-400. [PMID: 16848752 DOI: 10.2174/157340606777724077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The surface loops of proteins and active peptides are implicated in the activation of biological responses upon recognition by enzymes and receptors. Obviously, it is of interest to investigate these loops as potential leads for drug discovery. Currently, there is an urgent need for novel, general, and conformationally definite cyclic peptidomimetic scaffolds capable to mimic small portions of the protein surface. In this respect, 13-membered ring peptidomimetics can be considered privileged structures, since they represent the smallest possible systems that can retain all of the features of organized protein structures, such as single H-bonded alfa-helix loops and different kind of turns. In the present work, we report a novel family of 13-membered ring cyclic peptidomimetics based on a minimal PMRI (partially modified retro-inverse) peptide strategy; in particular, we describe the synthesis and the conformational analysis of a representative member of the family. These scaffolds have been designed to permit easy introduction in a combinatorial fashion of a range of pharmacophores that possess a diversity of structure, function, and 3D disposition.
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Affiliation(s)
- Luca Gentilucci
- Department of Chemistry "G. Ciamician", Università degli Studi di Bologna, via Selmi 2, 40126--Bologna, Italy.
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Rinaldo P, Yoon HR, Yu C, Raymond K, Tiozzo C, Giordano G. Sudden and unexpected neonatal death: a protocol for the postmortem diagnosis of fatty acid oxidation disorders. Semin Perinatol 1999; 23:204-10. [PMID: 10331471 DOI: 10.1016/s0146-0005(99)80052-4] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Fatty acid oxidation (FAO) disorders are frequently reported as the cause of sudden and unexpected death, but their postmortem identification remains difficult. Over a period of 5 years, the authors have identified 44 cases representing five FAO disorders and 19 additional cases without a diagnosis of a specific defect. Among the two groups, 13 patients died in the neonatal period, 10 in the FAO group, and three from the undetermined defect group. This outcome was consistently associated with exclusive breast feeding and presumably poor caloric intake. The diagnosis of FAO disorder in these cases was based on the analysis of postmortem liver and bile. In postmortem liver, informative findings are microvesicular steatosis, elevated fatty acid concentrations, glucose depletion, and low carnitine concentration. Bile carnitine analysis and acylcarnitine profiling have expanded significantly the effectiveness of the initial protocol and could lead, based on preliminary observations, to better identification of patients who may have been missed or left undetermined by the analysis of liver only. If an autopsy is not performed, informative findings can still be obtained by analysis of blood spots collected for newborn screenings and by biochemical testing of parents and asymptomatic siblings.
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Affiliation(s)
- P Rinaldo
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN 55905, USA
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