摘要:
Substituted eta(3)-butadienyl complexes containing amide-armed crowns (X) of general formula [MoCl(CO)(2)(eta(3)-CH2C(COX)-C=CH2)(phen)](n) (phen = 1,10-phenanthroline) were prepared and investigated for their ability to extract alkali metal ions from a mixed phase system. Reaction of the chlorocarbonyl precursor (1) with 1-aza-15-crown-5, 4'-aminobenzo-15-crown-5, 2-aminomethyl- 15-crown-5, 4'-aminobenzo-18-crown-6 or 2-aminomethyl-18-crown-6 gave monomeric complexes (n = 1), and addition of sodium tetraphenylboron to the 15-crown-5-substituted complexes gave the corresponding sodium salts. Dinuclear complexes (n = 2) were formed by reaction of 1 and 1,7-diaza-15-crown-5 or 4,4'(5)-diaminobenzo-15-crown-5. Comparison of amidobenzo- and 2-amidomethyl-15-crown-5-substituted complexes showed enhanced sodium transport properties for the latter, and spectroscopic and molecular modeling studies suggested complexation occurred by concerted action of the amide and crown. (C) 2004 Elsevier B.V. All rights reserved.