Some oxygen-donor di-N-thiocyanato–thorium(IV) and –uranium(IV) bis[hydrotris(pyrazol-1-yl)borate] complexes
- 1 January 1984
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 1,p. 19-21
- https://doi.org/10.1039/dt9840000019
Abstract
Di-N-thiocyanato–thorium(IV) and –uranium(IV) bis[hydrotris(pyrazol-1-yl)borate] complexes, M(NCS)2[HB(pz)3]2·xL [pz = C3H3N2; x= 1, M = Th, L = tetrahydrofuran (thf); M = U, L = thf, MeCONMe2, PMe2PhO, PMePh2O, or PPh3O; x= 2, M = Th, L = MeCONMe2, PMe3O, PMe2PhO, PMePh2O, or PPh3O; M = U, L = PMe3O; x= 1.5, M = Th, L = P(NMe2)3O], Th(NCS)2[HB(3,5Me2-pz)3]2 and U(NCS)2[HB(3,5Me2-pz)3]2·thf (3,5Me2-pz = 3,5-dimethylpyrazol-1-yl) have been prepared. The i.r. and u.v.–visible spectra [uranium(IV) complexes only] of these compounds are reported and the effects of steric crowding on the possible bonding arrangements of the hydrotris(pyrazol-1-yl)borate ligands are discussed in terms of a cone angle factor approach to steric crowding about the metal centres in these complexes.Keywords
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