
%0 Journal Article
%A Hambley, Trevor W. 
%A Afshar, Shahara 
%A Marcus, Sebastian T. 
%A Gahan, Lawrence R. 
%T Mercury(II) and Lead(II) Complexes of 1-Oxa-7-thia-4,10-diazacyclododecane ([12]aneN<emph tye="8">2</emph>OS)
%J Australian Journal of Chemistry
%D 1998/12/24
%V 52
%N 1
%P 1-6
%K 
%R https://doi.org/10.1071/C98096
%U https://www.publish.csiro.au/paper/C98096 
%X The mixed donor 12-membered macrocyclic ligand 1-oxa-7-thia-4,10-diazacyclododecane (&#91;12&#93;aneN2OS) has been synthesized and the mercury(II) and lead(II) complexes, &#91;Hg(&#91;12&#93;aneN2OS)(NO3)2&#93; and &#91;Pb(&#91;12&#93;aneN2OS)(NO3)2&#93;, have been isolated and characterized by X-ray crystallography. Crystals of the mercury complex are monoclinic, space group P 21/c, a 9&#183;576(2), b 10&#183;757(2), c 14&#183;789(4) &#197;, &#946; 93&#183;58(2)&#176;, whilst crystals of the lead complex are monoclinic, space group P 21/n, a 19&#183;490(7), b 8&#183;010(2), c 19&#183;576(6) &#197;, &#946; 109&#183;90(2)&#176;. The protonation constants and stability constants have been determined potentiometrically in aqueous solution. The protonation constants for &#91;12&#93;aneN2OS (log KHL 9&#183;13; log K H2L 6&#183;85) appear typical for secondary amines in similar trans-substituted 12-membered macrocycles. The magnitudes of the stability constants (HgII, log KHgL 10&#183;5; PbII, log KPbL 6&#183;6) are consistent with trends observed previously for macrocyclic ligands as secondary amine donors are replaced with oxygen and thioether donors. 
