Synthesis, Characterization of La(III), Nd(III), and Er(III) Complexes with Schiff Bases Derived from Benzopyran-4-one and Thier Fluorescence Study

Table 1

Analytical and physical data of the metal complexes of Schiff bases.

					C%	H%	N%	M%	Molar
Ligand or complexes	Symbol	Formula	M.W.	M : L	Calc.	Calc.	Calc.	Calc.	conductance (Ω^−1 cm^2 mol^−1)
					(found)	(found)	(found)	(found)
L^1	L^1	C16H12N2O4	296.28	—	64.86 (65.00)	4.08 (3.99)	9.46 (9.60)	—	—
[La L^1·OH·4H2O]·NO3·2H2O	La-L^1	C16H24LaN3O14	621.28	1 : 1	30.93 (30.89)	3.89 (3.87)	6.76 (6.70)	22.36 (22.26)	108
[Nd L^1·OH·4H2O]·NO3·4H2O	Nd-L^1	C16H28NdN3O16	662.64	1 : 1	29.00 (29.03)	4.26 (4.27)	6.34 (6.31)	21.77 (21.67)	109
[Er L^1·OH·4H2O]·NO3·H2O	Er-L^1	C16H22ErN3O13	631.62	1 : 1	30.42 (30.40)	3.51 (3.49)	6.65 (6.68)	26.48 (26.50)	111
L^2	L^2	C28H20N2O8	512.47	—	65.62 (65.69)	3.93 (3.79)	5.47 (5.37)	—	—
[La L^2·NO3·OH·C2H5OH·H2O]·H2O	La-L^2	C30H30LaN3O15	811.48	1 : 1	44.37 (44.40)	3.73 (3.73)	5.18 (5.18)	17.11 (17.12)	32
[Nd L^2·NO3·OH·C2H5OH·H2O]	Nd-L^2	C30H28NdN3O14	844.86	1 : 1	45.45 (45.49)	4.07 (4.06)	4.79 (4.97)	17.10 (17.07)	38
[Er L^2·NO3·OH·C2H5OH·H2O]	Er-L^2	C30H28ErN3O14	821.82	1 : 1	44.00 (43.85)	3.42 (3.43)	5.12 (5.11)	20.30 (20.35)	35
[La2 L^2·2NO3·OH.2C2H5OH·3H2O]·NO3	La2-L^2	C32H39La2N5O23	1137.47	2 : 1	33.58 (33.79)	3.24 (3.28)	6.09 (6.16)	24.35 (24.42)	124
[Nd2 L^2·2NO3·OH.2C2H5OH·3H2O]·NO3·H2O	Nd2-L^2	C32H39Nd2N5O24	1166.15	2 : 1	32.87 (32.96)	3.36 (3.37)	5.89 (6.01)	24.56 (24.74)	122
[Er2 L^2·2NO3·OH.2C2H5OH·3H2O]·NO3·3H2O	Er2-L^2	C32H43Er2N5O26	1248.22	2 : 1	30.86 (30.79)	3.43 (3.47)	5.72 (5.61)	26.72 (26.80)	124
L^3	L^3	C28H20N2O8	512.47	—	65.62 (65.89)	3.93 (3.84)	5.47 (5.29)	—	—
[La L^3·NO3·C2H5OH]·2H2O	La-L^3	C30H28LaN3O14	793.46	1 : 1	45.46 (45.41)	3.58 (3.56)	5.60 (5.29)	17.87 (17.51)	22
[Nd L^3·NO3·C2H5OH·H2O]·OH	Nd-L^3	C30H27NdN3O14	797.79	1 : 1	45.67 (45.17)	3.40 (3.41)	5.72 (5.27)	18.10 (18.08)	120
[Er2 L^3·2NO3·4H2O]·2OH·H2O	Er2-L^3	C28H30Er2N4O21	1093.07	2 : 1	31.00 (30.77)	2.75 (2.77)	5.22 (5.12)	30.70 (30.60)	157