
TY  - JOUR
A1  - Cosgriff, JE 
A1  - Deacon, GB 
A1  - Gatehouse, BM 
A1  - Hemling, H 
A1  - Schumann, H 
T1  - Organoamido- and Aryloxo-lanthanoids. X. Tris(&#951;<sup>2</sup>-3,5-di-t-butylpyrazolato)lanthanoid(III) Complexes and the X-Ray Crystal Structure of Er(&#951;<sup>2</sup>-Bu<sup>t</sup><sub>2</sub>pz)<sub>3</sub>(thf)<sub>2</sub>
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1994
VL  - 47
IS  - 7
SP  - 1223
EP  - 1235
KW  - 
UR  - https://doi.org/10.1071/CH9941223 
N2  - The complexes Ln (But2pz)3( thf )2 ( Ln = Y, La, Pr, Nd , Sm, Gd, Dy , Er , Yb, Lu; But2pz- = 3,5-di-t-butylpyrazolate; thf = tetrahydrofuran ), and [ Ln (But2pz)3(OPPh3)2].( dme )n ( Ln = La, n = &#8532; ; Ln = Er , n = 1; dme = 1,2-dimethoxyethane) have been prepared by reaction of the lanthanoid metal with bis ( pentafluorophenyl )mercury and the corresponding pyrazole in either thf , or in dme in the presence of triphenylphosphine oxide. The X-ray crystal structure of Er (&#951;2-But2pz)3( thf )2 [monoclinic, space group P21 (No. 4), a 9.738(4), b 19.602(4), c 11.636(4) &#506;, &#946; 99.42(3)&#176;, R 0.0374 for 3667 observed reflections] shows the complex to be an eight-coordinate monomer with three chelating But2pz ligands . The arrangement of centres ( Cen ) of the N-N bonds of the But2pz ligands [< Er -N> 2.336 &#506;; Cen-Er-Cen 140.1(4)&#176;, 110.3(4)&#176; and 109.6(4)&#176;] and the thf oxygen atoms [< Er -O> 2.351 &#506;; O- Er -O 140.1(4)&#176;] is intermediate between trigonal bipyramidal and square pyramidal. The other Ln (But2pz)3( thf )2 complexes and Ln (But2pz)3(OPPh3)2 are considered to have similar structures. 
ER  -

