
TY  - JOUR
A1  - Harrowfield, JM 
A1  - Ogden, MI 
A1  - White, AH 
T1  - Lanthanide Ion Complexes of Calixarenes.  VII. Bimetallic Lanthanide Complexes of p-t-Butylcalix[8]arene From Dimethyl Sulfoxide Solutions
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1991
VL  - 44
IS  - 9
SP  - 1237
EP  - 1247
KW  - 
UR  - https://doi.org/10.1071/CH9911237 
N2  - Reaction of Ln (ClO4)3.x dmso ( dmso denotes dimethyl  sulfoxide ) with a warm p-t- butylcalix [8] arene (L) slurry in acetone/ dmso yields crystalline 2:1 Ln/ligand adducts, characterized as dmso olvates and established to be [Ln2(L-6H)( dmso )5].~2dmso by single- crystal X-ray studies at c. 295 K for Ln = La, Eu , Tm and Lu. All complexes are isomorphous , orthorhombic, Pcnb, a &#8776; 34, b &#8776; 23, c &#8776; 14 &#506;, Z 4, with a similar complex molecule in each case, one half comprising the asymmetric unit; the second half is generated by a crystallographic twofold axis. The two lanthanide atoms are encompassed by the macrocycle and are eight coordinate, involving phenolic and dmso O-donor atoms, five of the former (two bridging) and three of the latter (one bridging). The array closely resembles that found in analogous dmf solvent adducts: the bridging dmso lies on the crystallographic twofold axis through the complex, its peripheral atoms being modelled by disorder. 
ER  -

