Synthesis, Characterization, and Electrochemical Behaviour of Cobalt(II) and Nickel(II) Complexes with N_𝟐O_𝟐 Chelating Ligand 4,4′-(Biphenyl-4,4′-diyldinitrilo)dipentan-2-one

Table 1

Main analytical data for the ligand and its complexes in the solid state.

Compound	Color	Yield (%)	M.p. (°C)	M^+	Elemental analysis found (calcd.) (%)
					C	H	N
H2L	Yellow	83	134	348.2	75.68 (75.83)	7.14 (6.94)	7.75 (8.04)
([Co(H2L)]^4+)2	Blue	65	>260	814.7	64.78 (64.86)	6.21 (5.93)	6.99 (6.87)
([Ni(H2L)]^4+)2	Yellow	79	>260	814.2	64.64 (64.90)	6.16 (5.94)	7.04 (6.88)
[(CoCl2)2(H2L)]^4+	Green	60	>260	608.1	43.72 (43.45)	4.25 (3.97)	4.75 (4.60)
[(NiCl2)2(H2L)]^4+⋅2H2O	Yellow	58	>260	—	41.01 (41.18)	4.30 (4.08)	4.65 (4.36)