Coordination Compounds of Scandium

As already mentioned, the ionic radius of Sc + is, at 0.745 A (for 6-coordination), the largest of the metals in its period, so that high coordination numbers are frequently met with in its chemistry examples between 3 and 9 are known. Sc has I = 7/2 and a few NMR studies are being reported. 

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Furthermore, these bulky aryloxide ligands played a crucial role in making the crystallographically characterized less-familiar three-coordinate compounds of scandium, yttrium, and the lanthanides (Ln), such as Ln(OC6H2-r-Bu2-2,6-R-4)3 (28) more accessible. 

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