trans- and cis-1,3,5,7-tetraaradecalin (TAD) (2 and 3) were isolated and structurally characterized (VT-NMR). One of the cis-TAD derivatives intended to act as 'cores' of new host systems, 2,6-dihydroxymethyl)-cis-TAD (5), gave heavy metal ion (Cd(II), Pb(II), etc.) complexes with remarkably high binding constants, as measured by polarography. X-ray analyses of the Cd(II) (7a) and Pb(II) (7b) complexes revealed a new, unique binding mode.
Bibliographical noteFunding Information:
This work was supported in part by grants from the Israel Science Foundation, the Ministry of Science and the Ministry of Absorption (to M. G.). The invaluable help of Prof. E. Eisner with the electrochemical methods and the skillful assistance of Ms. Zafra Stein with the X-ray measurements are gratefully acknowledged.