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- W2090221234 abstract "The anions [ReX3(CO)2(NO)]- (with X = Cl, 1; X = Br, 2) have been prepared with different counterions. Complex 1 was found to lose its chloride ligands in water within 24 h. The [Re(H2O)3(CO)2(NO)]2+ cation obtained after hydrolysis is a strong acid, which consequently undergoes a slow condensation reaction in water to form the very stable [Re(mu3-O)(CO)2(NO)]4 cluster 4 at pH > 2, that precipitates from the aqueous solution and is insoluble also in organic solvents. Fast deprotonation of [Re(H2O)3(CO)2(NO)]2+ did not lead to 4 but rather to the mononuclear species [Re(OH)(H2O)2(CO)2(NO)]+. Subsequent attack of OH- at a CO group resulted in the formation of a rhenacarboxylic acid and its carboxylate anion. For solutions of even higher pH, IR spectroscopy provided evidence for the formation of a Re(C(O)ON(O)) species. These processes were found to be reversible on lowering the pH. Starting from cluster 4 it was possible to obtain complexes of the types [ReX(CO)2(NO)L2] or [Re(CO)2(NO)L3](L2 = 2-picolinate, 2,2'-bipyridine, L-phenylalanate; L3 = tris(pyrazolyl)methane, 1,4,7-trithiacyclononane) in the presence of an acid in protic solvents, but only in low yields. In further synthetic studies, complexes 1 and 2 were found to be superior starting materials for substitution reactions to form [ReX(CO)2(NO)L2] or [Re(CO)2(NO)L3] complexes." @default.
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- W2090221234 date "2005-01-01" @default.
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- W2090221234 title "The chemistry of the fac-[Re(CO)2(NO)]2+ fragment in aqueous solution" @default.
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- W2090221234 doi "https://doi.org/10.1039/b417425a" @default.
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