CAS 210706-03-9: tetraethyl 2,2',2'',2'''-{[5,11,17,23-tetra-tert-butyl-2,8,14,20-tetrathiapentacyclo[19.3.1.1~3,7~.1~9,13~.1~15,19~]octacosa-1(25),3(28),4,6,9(27),10,12,15(26),16,18,21,23-dodecaene-25,26,27,28-tetrayl]tetrakis(oxy)}tetraacetate

4-tert-Butyl-1-(ethoxycarbonylmethoxy)thiacalix[4]arene is a new voltammetric sensor for the detection of Hg(II) ions. This compound has an optimum sensitivity for mercury, which is linear over the range of 0.01 to 1.0 μM and shows a high selectivity for mercury over other toxic metals such as lead, copper, and silver. The compound has been applied successfully in the development of a novel sensitive voltammetric method with high selectivity for mercury ions.