Magnetic properties date of complexes 1–6.

	1	2	3	4	5	6
T (K)	25–300	25–300	25–300	60–300	50–300	70–300
C (emu mol−1 K)	1.3	1.17	1.94	4.59	4.42	4.81
θ (K)	−1.26	1.65	−34.64	−0.28	−5.74	−4.52
χ M T value at 300 K	1.31	1.17	1.95	4.45	4.15	4.55
χ M T value at 2 K	0.51	0.62	0.41	2.52	0.31	1.56