Synthesis and Characterization of β-Diketimine Schiff Base Complexes with Ni(II) and Zn(II) Ions: Experimental and Theoretical Study

Table 1

¹H and¹³C NMR theoretical and experimental values for the structures of 1 & 2 (in ppm).

	^1H NMR theoretical	^1H NMR experimental		^13C NMR theoretical	^13C NMR experimental
β-Diketimine 1
Benzene ring	7.41–8.2	7.38–8.07	1C	168	166.3
43H, 44H, 50H, 51H	4.5	4.3	3C	169	166.3
4H, 55H	3.6	3.1	2C	42	38.5
(45H, 46H, 47H, 52H, 53H, 54H)	1.35–1.45	1.34	35C & 37C	158	156
			7C & 17C	155	153
(28H, 29H, 30H, 32H, 33H, 34H)	1.94–2.3	1.99–2.1	14C & 24C	129	128
			Benzene ring	121–130	122–132
			41C & 48C	63	61
			42C & 49C	19	16
			27C & 31C	26	24
β-Diketimine tautomer of 1
55H	12.3	12.61	1C	152	153.6
Benzene rings	7.42–8.4	7.38–8.07	3C	168	166.3
4H	5.1	4.95	2C	69	61
(43H, 44H, 50H, 51H)	4.6	4.3	17C	147	143
			7C	158	153
(45H, 46H, 47H, 52H, 53H, 54H)	1.34–1.45	1.34	35C & 37C	158	156
			Benzene rings	123–133	122–135
	1.96–2.2	1.99–2.2	41C & 48C	65	61
(28H, 29H, 30H, 32H, 33H, 34H)			27C & 31C	26	24
			42C & 49C	18	16
Ni(II) β-diketimine 2
Benzene rings	7.1–8.7	7.25–8.4	9C	24.1	25
(52H, 53H, 59H, 60H)	4.45	4.8	51C & 58C	22	20
4H	5.3	5.2	16C & 20C	27	25
11H, 12H	3.85	4.15	10C	70	71
6 methyl groups	1.25–2.65	1.24–2.52	50C & 57C	67.8	63
65H	3.16	3.51	2C	72	71
13H, 14H, 15H	1.11	1.1	24C & 34C	155	153
			Benzene rings	124–135	125–137
			1C & 3C	172	169
			44C & 47C	161	158
Zn(II) β-diketimine 3
Benzene rings	7.2–8.5	7.3–8.2	60C	23.5	24
(45H, 46H, 52H, 53H)	4.6	4.72	44C & 51C	20	18
4H	5.2	5.1	28C & 32C	28	24
61H, 62H	3.9	4.1	59C	69	70
6 methyl groups	1.2–2.7	1.23–2.5	43C & 50C	68.3	61
58H	3.2	3.45	2C	70	72
63H, 64H, 65H	1.14	1.1	8C & 18C	156	154
			Benzene rings	123–133	124–135
			1C & 3C	170	168
			37C & 39C	159	157