Synthesis and Characterization of Heteronuclear Copper(II)-Lanthanide(III) Complexes of N,N′-1,3-Propylenebis(Salicylaldiminato) Where Lanthanide(III) = Gd or Eu

Table 1

Analytical data, magnetic moment, and electronic spectral data of ligand(salbn), [Cu(salbn)], and [Cu(salbn)Ln(NO₃)₃⋅H₂O)] complexes where Ln = Eu or Gd.

Compound	Complex	Colour	dp	Analytical found/(calc) (%)					𝜆 max	^a𝜇eff	Yield
			(°C)	C	H	N	Cu	Ln	(nm)	^#(BM)	(%)
N,N′-1,3-propylenebis; (salicylaldiminato), salbn		Yellow	*105	71.98; (72.34)	6.32; (6.38)	9.70; (9.92)	—	—			89
[Cu(II)(salbn)]	1	Green	*(187)	59.36; (59.38)	5.00; (4.65)	7.88; (8.15)	18.90; (18.49)	—	597	1.73	87
[Cu(II)(salbn)Gd(NO3)3 · H2O]	2	Dark; green	(295)	29.09; (28.95)	2.75; (2.55)	10.10; (9.93)	9.20; (9.01)	21.79; (22.28)	615	8.06	80
[Cu(II)(salbn)Eu(NO3)3 · H2O]	3	Dark; green	(287)	29.06; (29.16)	2.49; (2.57)	9.90; (10.00)	8.89; (9.08)	21.38; (21.72)	613	3.84	77

Salbn: N,N′-1,3-propylenebis(salicylaldiminato); Ln: lanthanide; *mp (°C): melting point; dp: decomposition point; ^asusceptibility values of the respective complexes were measured at 298 K; ^#magnetic moments can be calculated by using the equation 𝜇_M^Calc = [(𝜇Cu)² + (𝜇Ln)²]^1/2.