Table 2.

IR and ¹H NMR spectral data.

Compound	Infrared spectral data					1H NMR spectral data ($\delta$, ppm)
	$\nu$(C=N)	$\nu$(NH)	$\nu$(COC)	$\nu$ M−N	$\nu$ M−X
QBD	1658	3330	—	—	—	10.65 (s, 1H, NH), 7.2–7.8 (m, 9H, Ar−H),
						8.4 (s, 1H, H−C=N),
QBO	1651	—	1022	—	—	8.3 (s, 1H, H−C=N),
						7.1–8.0 (m, 9H, Ar−H)
[Co(QBD)2Cl2]	1615	3320	—	440	350	10.95 (s, 1H, NH), 7.2–8.8 (m, 9H, Ar−H),
						8.4 (s, 1H, H−C=N),
[Co(QBO)2Cl2]	1615	—	995	458	368	8.3 (s, 1H, H−C=N),
						7.5–8.9 (m, 9H, Ar−H)
[Ni(QBD)2Cl2]	1620	3310	—	467	250	10.90 (s, 1H, NH), 7.2–8.8 (m, 9H, Ar−H),
						8.4 (s, 1H, H−C=N),
[Ni(QBO)2Cl2]	1631	—	996	449	264	8.3 (s, 1H, H−C=N),
						7.5–8.9 (m, 9H, Ar−H)
[Zn(QBD)Cl2]	1625	2990	—	428	348	10.90 (s, 1H, NH), 7.2–7.8 (m, 9H, Ar−H),
						8.4 (s, 1H, H−C=N),
[Zn(QBO)Cl2]	1615	—	1002	432	350	8.3 (s, 1H, H−C=N),
						7.5–8.9 (m, 9H, Ar−H)
[Cd(QBD)Cl2]	1610	3300	—	432	348	10.85 (s, 1H, NH), 7.2–7.8 (m, 9H, Ar−H),
						8.4 (s, 1H, H−C=N),
Cd(QBO)Cl2]	1610	—	998	428	360	8.3 (s, 1H, H−C=N),
						7.1–8.0 (m, 9H, Ar−H)