purification. p-tert-Butyl phenol
and NAOH were purchased from SRL; formaldehyde was purchased from
labort chemicals; anhydrous AlCl3 was purchased from Spectrochem;
methyl bromoacetate was purchased from Merck; hydrazine hydrate and
3-thiophene acetic acid were purchased from TCI; and AgNO3 was purchased from S. D. Fine Chemicals. Perchlorate salts of different
metal ions were purchased from Sigma-Aldrich. All organic solvents
were of AR grade and were purchased from Fisher Scientific.