Add time:08/01/2019         Source:sciencedirect.com

Three mononuclear 1,3,5-trimethylbenzene (mesitylene) carbonyl transition metal complexes, mesitylene tricarbonyl chromium, (CH3)3C6H3Cr(CO)3 (1), mesitylene tricarbonyl tungsten, (CH3)3C6H3W(CO)3 (2), mesitylene tricarbonyl manganese tetra-fluoroborate, [(CH3)3C6H3Mn(CO)3]BF4 (3); and three clusters, mesitylene nonacarbonyl tetracobalt, (CH3)3C6H3Co4(CO)9 (4), mesitylene carbido tetradecacarbonyl hexaruthenium, (CH3)3C6H3Ru6C(CO)14 (5) and carbido heptadecacarbonyl hexaruthenium, Ru6C(CO)17 (6), have been studied by means of 1H, 13C and natural abundance 17O NMR spectroscopy. Generally, the 1H and 13C NMR chemical shifts of the aromatic protons and carbons in the compounds studied show clearly shielded values when compared with those of uncomplexed mesitylene. The 13C NMR chemical shifts of the carbonyl groups show an inverse relation with the corresponding 17O chemical shifts in agreement with the effect of π-backbonding. 1J(C, H) spin-spin coupling constants of aromatic carbons in mesitylene moiety of chromium and tungsten complexes show clearly increased values when compared with uncomplexed mesitylene. This can be explained by an increased s-character in the CH bond induced by the σ-effect of the bound metal. Of the NMR methods studied, 17O NMR was shown to have very promising properties owing to the exceptionally high sensitivity and small line width of NMR signals.

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