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Titolo:
Matrix assisted laser desorption/ionisation (MALDI)-TOF mass spectrometry of supramolecular metalloporphyrin assemblies: a survey
Autore:
Stulz, E; Mak, CC; Sanders, JKM;
Indirizzi:
Univ Cambridge, Chem Lab, Cambridge CB2 1EW, England Univ Cambridge Cambridge England CB2 1EW Lab, Cambridge CB2 1EW, England
Titolo Testata:
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
fascicolo: 5, , anno: 2001,
pagine: 604 - 613
SICI:
1472-7773(2001):5<604:MALD(M>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
TIME-OF-FLIGHT; PORPHYRIN DIMERS; NONCOVALENT INTERACTIONS; ELECTROSPRAY-IONIZATION; MOLECULAR RECOGNITION; BUILDING-BLOCKS; COMPLEXES; RUTHENIUM; COORDINATION; ARRAYS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
48
Recensione:
Indirizzi per estratti:
Indirizzo: Sanders, JKM Univ Cambridge, Chem Lab, Lensfield Rd, Cambridge CB2 1EW, England Univ Cambridge Lensfield Rd Cambridge England CB2 1EW ngland
Citazione:
E. Stulz et al., "Matrix assisted laser desorption/ionisation (MALDI)-TOF mass spectrometry of supramolecular metalloporphyrin assemblies: a survey", J CHEM S DA, (5), 2001, pp. 604-613

Abstract

Analysis of a representative series of metalloporphyrins and of their supramolecular assemblies using laser desorption/ionisation time of flight massspectrometry (LDI-TOF MS) revealed that non-covalent metal-ligand interactions in the complexes remain effective in the gas phase. Detectable assemblies range from simple ruthenium(II) porphyrin complexes with N- or P-donor ligands, or tin(IV) and zirconium(IV) porphyrin complexes with O-donor ligands, up to trimeric arrays. Crucial to successful recording of intact complexes is avoiding protic matrices which interfere with Lewis acidic analytesand which may induce ligand exchange reactions to form complexes with the matrix itself. Also described is the in situ generation of a series of ruthenium(II) porphyrin dimers via laser induced vaporisation of the corresponding monomers and the suppression of dimerisation by nitrogen and phosphorusligands. Careful adjustment of instrument parameters such as incident laser energy requires special attention. Relative affinities in complexation reactions are found to be consistent with liquid phase chemistry, therefore LDI-MS can provide a fast and simple, yet effective screening method for reactivity exploration. However, it also induces side-reactions such as iodineabstraction/transfer reactions. Furthermore, structurally different porphyrins show variations up to 90% in relative ion formation. Extreme caution is therefore required in the interpretation, and particularly in the quantitation, of such mass spectra.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 10:49:52