Host–Guest Extraction of Heavy Metal Ions with p-t-Butylcalix[8]arene from Ammonia or Amine Solutions

Table 2

Elemental analysis of Cu²⁺-H₈L and Cd²⁺-H₈L complexes and estimated chemical formula.

Cu^2+: estimate chemical formula				Cd^2+: estimate chemical formula
Cu(en)2H6L.5H2O				Cd(en)2 H6L.3H2O
H(%) C(%) N(%)				H(%) C(%) N(%)
Obs.	8.37	70.89	3.56	Obs.	8.18	69.90	3.49
Calc.	8.73	70.40	3.57	Calc.	8.41	69.83	3.54