
TY  - JOUR
A1  - Deacon, GB 
A1  - Feng, TC 
A1  - Nickel, S 
A1  - Ogden, MI 
A1  - White, AH 
T1  - Organoamido- and Aryloxo-lanthanoids. IV. Synthesis and X-Ray Structures of Low-Coordinate [Yb(O-2,4,6-Bu<sup>t</sup><sub>3</sub>C<sub>6</sub>H<sub>2</sub>)<sub>3</sub>(thf)] and [Yb(O-2,4,6-Bu<sup>t</sup><sub>3</sub>C<sub>6</sub>H<sub>2</sub>)<sub>2</sub>(&#956;-OH)(thf)]<sub>2</sub> (thf = Tetrahydrofuran)
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1992
VL  - 45
IS  - 4
SP  - 671
EP  - 683
KW  - 
UR  - https://doi.org/10.1071/CH9920671 
N2  - Reaction of Yb ( Otbp )2( thf )3( tbp = 2,4,6 But3C6H2; thf = tetrahydrofuran ) with TlOtbp in tetrahydrofuran at room temperature yields thallium metal and Yb( Otbp )3( thf ) (1), which was also obtained by redox  transmetallation between TlOtbp and ytterbium metal in refluxing tetrahydrofuran . Some [ Yb ( Otbp )2( µ-OH) (thf)]2 (2) was also isolated from the first synthesis and is derived from hydrolysis of Yb ( Otbp )3( thf ) by traces of water. The X-ray crystal structure of (1) [triclinic, P1, a 21.78(1), b 13.89(2), c 10.461(4)Å , &#945;; 109.03(5), &#946; 99.03(3), &#947;; 98.34(5)º, Z 2, No = 4354 'observed' data refined to R 0.0711 shows novel distorted tetrahedral four coordination for ytterbium [0-Yb-0 angles 90.6(5)-121.8(4)º, which is bonded more strongly to the aryl oxide [Yb-0 1.97(1), 2.02(1), 2.09(1) Å ] than to thf [Yb-0 2.35(1) Å. The X-ray structure of (2) [triclinic, P1, a 15.61(1), b 13.84(2), c 11.085(4) Å, &#945; 99.25(9),, &#946; 94.46(4), &#947; 96.42(9), Z 1, No = 4718 'observed' data refined to R 0.050] indicates a centrosymmetric hydroxo -bridged dimer with a YbO2Yb core. Ytterbium has irregular five coordination with two bridging hydroxide oxygens [Yb-0 2.217(6), 2.199(6) A; 0-Yb-0' 70.2(2)º, Yb-O-Yb, 109.8(3)º, non-bonding Yb&#8230;Yb 3.614(2) A], two phenoxide  oxygens [2.047(7), 2.073(6) Å], and a more distant thf oxygen [2.363(8) Å ]. 
ER  -

