
%0 Journal Article
%A Asfari, Zouhair 
%A Harrowfield, Jack M. 
%A Thu&eacute;ry, Pierre 
%A Nierlich, Martine 
%A Vicens, Jacques E. 
%T Multiple Metal Coordination by Calixarenes: A Structure Determination of Relevance to the Use of Calixarenes as Solvent Extraction Agents
%J Australian Journal of Chemistry
%D 1999/07/23
%V 52
%N 5
%P 403-408
%K 
%R https://doi.org/10.1071/CH98178
%U https://www.publish.csiro.au/paper/CH98178 
%X An insoluble material formed in attempts to extract the copper(II) complex of (R,S)-5,5,7,12,12,14- hexamethyl-1,4,8,11-tetraazacyclotetradecane with the tetraanion of tetrakis(carboxymethyl) p-t-butylcalix&#91;4&#93;arene recrystallizes from pyridine with the composition &#91;Cu(C16H36N4)&#93; &#91;Na2(C52H60O12)&#93;.2C5H5N.4&#183;5H2O. The crystals are monoclinic, space group P 21/c (C52h, No. 14); a 26&#183;8524(8), b 12&#183;8151(2), c 25&#183;6525(8) &#197;; &#946; 115&#183;356(1)&#176;. The structure was refined on F2 (11379 reflections, 955 parameters), giving conventional R1 0&#183;057 (wR2 0&#183;118). The calixarene encapsulates two sodium ions and has only tenuous connection to the copper/macrocycle complex through axial coordination of one carboxylate oxygen. 
