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45Sc NMR study of scandium complex formation in non-aqueous solutions

✍ Scribed by G. A. Kirakosyan; V. P. Tarasov; Yu. A. Buslaev

Publisher: John Wiley and Sons
Year: 1989
Tongue: English
Weight: 724 KB
Volume: 27
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1260270202

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✦ Synopsis

Sc NMR parameters of isomeric Sc"' hexacoordinated complexes ScCI,-,L:-3 formed by the interaction of ScCI, with donor monodentate molecules of trimethyl phosphate, dimethyl sulphoxide, dimethylformamide, dimethylacetamide, formamide, tetramethylurea and Ph,PO in non-aqueous solutions of CH,CN, CH,NO, , (CH,),CO, CH,C(O)OC,H,, C,H,O and (C,H,),O are reported. cis-ScCL,(TMP), has been shown to be the preferred species in solvents of low polarity. Increasing polarity of the medium leads to an increase in the relative concentration of trms-ScCI,(TMP), , which has been explained in terms of the different solvation of cis and trms molecules owing to the difference in their polarity. The range of "Sc NMR chemical shifts in scandium complexes covers ca 340 ppm. KEY WORDS 45Sc NMR chemical shift scale Sc"' complex formation Solvation effect on isomer stability

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