Polydentate Schiff Base Ligands and Their La(III) Complexes: Synthesis, Characterization, Antibacterial, Thermal, and Electrochemical Properties

Table 2

Infrared, electronic spectral, and molar conductivities^a data for the Schiff base ligands and their metal complexes (cm⁻¹).

Compound	𝜈(–OH)	𝜈(CH3)	𝜈(CH=N)	𝜈(C–OH)	𝜆max (nm)	^aΛ
H2L^1	3350	2941	1638	1326	305, 345, 405, 420	5.6
H2L^2	—	2984	1613	1304	345, 405, 430, 465	6.7
H2L^3	3099	—	1614	1324	305, 405, 430, 465	5.9
H2L^4	3432	—	1659	1306	330, 430, 465	5.5
La2(L^1)(NO3)4(H2O)4	3393	2950	1646	1291	315, 345, 405, 430	18.5
La(L^2)(NO3)(H2O)	3350	2989	1634	1296	345, 405, 420, 465	13.2
La2(L^3)(NO3)4(H2O)4	3334	—	1624	1287	305, 405, 430, 465	16.5
La2(L^4)(NO3)4(H2O)4	3361	—	1611	1306	305, 345, 405, 430, 465	15.8

^a: Ω⁻¹cm² mol⁻¹ (25°C).