
%0 Journal Article
%A Chandler, CJ 
%A Gable, RW 
%A Gulbis, JM 
%A Mackay, MF 
%T Preparation and Structural Characterization of a Diaza 21-Crown-7 Ether Complex With Barium Picrate - (3,6,9,12,15-Pentaoxa-26,29-Diazatetracyclo[15.8.4.020,28.023,27]-Nonaco Sa-17,19,21,23,25(1),26,28-Heptaene-2,16-Dione)Barium(II) Picrate
%J Australian Journal of Chemistry
%D 1988/05/01
%V 41
%N 5
%P 799-806
%K 
%R https://doi.org/10.1071/CH9880799
%U https://www.publish.csiro.au/paper/CH9880799 
%X The synthesis, characterization and crystal stucture of the title complex is reported. The triclinic crystals belong to the space group P&#299; with a 12.726(5), b 14.284(5), c 11.094(5)&#506;, &#945; 95.76(5),&#946; 93.42(4), &#947; 88.66(5)° and Z 2. Refinement with 5365 diffractometer data measured with Cu K&#945; radiation converged at R 0.096. The barium ion is coordinated by a diaza 21-crown-7 ether ligand , which incorporates a phenanthroline moiety, and by two bidentate  picrate anions, and thus has 11-coordination. The Ba -O bonds range from 2.62(1) to 3.02(1)&#506; and the Ba -N bonds have lengths of 3.00(1) and 3.05(1)&#506;. Disorder is evident in the aliphatic chain of the polyether and, apart from the orientation about a C-O bond in the disordered segment of the chain, the angles about the C-O and C-C bonds define gauche and anti conformations respectively. 
