The carbonyl resonances of [Re3(μ-H)4(CO)9(NCMe)]- have been assigned and the 13C spin-lattice relaxation times measured at different field strengths (20.15,50.31, and 75.43 MHz) at 238 K. The results indicate that scalar coupling of the second kind with rhenium isotopes is the dominant relaxation mechanism at this temperature. Values of T1Q (Re) and 1J(187Re-C) were calculated. The presence on the H2Re(CO)3(NCMe) moiety of a poor π-acceptor ligand doubles 1J(187Re-C) with respect to the unsubstituted H2Re(CO)4 moiety in the precursor [Re3(μ-H)4(CO)10]-.

C-13 NUCLEAR-MAGNETIC-RESONANCE STUDY OF THE PROPERTIES OF THE UNSATURATED ANION {[RE3(MU-H)4(CO)9(NCME)]- AT LOW-TEMPERATURE} / T. BERINGHELLI, G. D'ALFONSO, H. MOLINARI. - In: JOURNAL OF THE CHEMICAL SOCIETY DALTON TRANSACTIONS. - ISSN 0300-9246. - :8(1987), pp. 2083-2085. [10.1039/dt9870002083]

C-13 NUCLEAR-MAGNETIC-RESONANCE STUDY OF THE PROPERTIES OF THE UNSATURATED ANION {[RE3(MU-H)4(CO)9(NCME)]- AT LOW-TEMPERATURE}

T. Beringhelli
Primo
;
G. D'Alfonso
Secondo
;
1987

Abstract

The carbonyl resonances of [Re3(μ-H)4(CO)9(NCMe)]- have been assigned and the 13C spin-lattice relaxation times measured at different field strengths (20.15,50.31, and 75.43 MHz) at 238 K. The results indicate that scalar coupling of the second kind with rhenium isotopes is the dominant relaxation mechanism at this temperature. Values of T1Q (Re) and 1J(187Re-C) were calculated. The presence on the H2Re(CO)3(NCMe) moiety of a poor π-acceptor ligand doubles 1J(187Re-C) with respect to the unsubstituted H2Re(CO)4 moiety in the precursor [Re3(μ-H)4(CO)10]-.
Settore CHIM/03 - Chimica Generale e Inorganica
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/187868
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