
%0 Journal Article
%A Cosgriff, JE 
%A Deacon, GB 
%A Gatehouse, BM 
%A Hemling, H 
%A Schumann, H 
%T 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>
%J Australian Journal of Chemistry
%D 1994/07/01
%V 47
%N 7
%P 1223-1235
%K 
%R https://doi.org/10.1071/CH9941223
%U https://www.publish.csiro.au/paper/CH9941223 
%X 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. 
