Synthesis of New Chiral, C₂Symmetric Receptors Containing Quaternary Ammonium Salts

oC (12 wt.%) corresponds to the removal of interlayer water molecules, which was confirmed by a decrease of 3 in the basal spacing. The basal spacing was increased again progressively when the samples were cooled down to room temperature and kept on in air at relative humidity of 60%. The phenomenon indicates the reversible deintercalation and intercalation of interlayer water molecules in the temperature range of 25-150 o C. Beyond 280 o C, the host HDSs readily decomposes itself along with a strong exothermic decomposition of interlayer acetates. 11 According to the relative atomic ratios from the results of ICP and CHN analyses, and water content from thermogravimetric analyses, formulas could be proposed to be Ni 0.82 Zn 0.36 (OH) 2 (CH 3 COO) 0.30 (OH) 0.06 (H 2 O) 0.98 for HT(60) and Ni 0.74 Zn 0.52 (OH) 2 (CH 3 COO) 0.42 (OH) 0.10 (H 2 O) 1.10 for CP(60), respectively.