Synthesis and Characterization of Trivalent Cerium Complexes of p-tert-Butylcalix[4,6,8]Arenes: Effect of Organic Solvents

Table 3

¹H-NMR spectra of the parent ligands and their Ce³⁺-p-t-butylcalix[𝑛]arene (𝑛 = 4, 6 and 8) complexes at 25°C.

	Solvent	Complex pattern	Ar–C(CH3)3	Ar–CH2–Ar	Ar–H	Ar–OH
Ligand-1	CDCl3		1.26 (s, 9)	4.1 (br.d, 1)	7.08 (s, 2)	9.6 (s, 1)
				3.1 (br.d, 1)
Complex 1		3.10 (br, 1)	1.25 (s, 9)	4.3 (br.d, 1)	7.12 (s, 2)	10.4 (s, 1)
				3.8 (br.d, 1)
Ligand-2	CDCl3		1.25 (s, 9)	3.77 (d, 1)	7.08 (s, 2)	10.0 (s, 1)
Complex 2		2.57 (s, 1)	1.26 (s, 9)	3.89 (s, 2)	7.14 (s, 2)	10.3 (s, 1)
		3.00 (d, 1)
Ligand-3	CDCl3		1.24 (s, 9)	4.3 (br, d, 1)	7.10 (s, 2)	9.6 (s, 1)
Complex 3		3.00 (s, 1)	1.27 (s, 9)	4.3 (br, d, 1)	7.14 (s, 2)	10.3 (s, 1)
				3.4 (br, d, 1)

s: singlet, br: broad, d: doublet.