Synthesis and Characterization of New Schiff Bases Derived from N (1)-Substituted Isatin with Dithiooxamide and Their Co(II), Ni(II), Cu(II), Pd(II), and Pt(IV) Complexes

Table 2

Electronic spectra, spectral parameters and magnetic moment with suggested structures of L_I, L_II, and L_III complexes.

Symbol	Band positions (cm^-1)	Assignment	Dq/B (𝛽)	B (cm^-1)	10Dq (cm^-1)	𝜇eff (B.M)	Suggested structure	Molar conductivity S⋅mol^-1⋅cm^2 in DMF and DMSO*
	𝜈1 6388 (cal.)	^4A2→^4T2		470.2	6112	4.5	Tetrahedral	32.12*
C1a	𝜈2 10752	^4A2→^4T1(F)	1.3
Co(II)	𝜈3 16930 (avr.)	^4A2→^4T1(P)	(0.484)
	𝜈4 21008	L→M(C.T)
	𝜈1 6388 (cal.)	^4A2→^4T2		470.2	6112	4.61	Tetrahedral	29.7*
C1b	𝜈2 10752	^4A1→^4T1(F)	1.3
Co(II)	𝜈3 16930 (avr.)	^4A2→^4T1(P)	(0.484)
	𝜈4 21881	L→M(C.T)
C2	𝜈1 12345	^3A2g→^3T2g	2.8	454.2	12717	3.31	Octahedral	46.45
Ni(II)	𝜈2 16806	^3A2g→^3T1g(F)	(0.440)
	𝜈3 27035 (cal.)	^3A2g→^3T1g(P)
	𝜈1 12150	^2B1g→^2A1g				2.36	Octahedral	68.19
C3	𝜈2 16666	^2B1g→^2B2g
Cu(II)	𝜈3 18761	^2B1g→^2Eg
	𝜈4 19646	L→M(C.T)
C4	𝜈1 12048	^1A1g→^1A2g				Diamagnetic	Square planar	60.37
Pd(II)	𝜈2 16949	^1A1g→^1B1g
	𝜈3 20618	^1A1g→^1Eg
C5	𝜈1 17825	^1A1g→^3T1g(H)				Diamagnetic	Octahedral	154.13
Pt(IV)	𝜈2 22371	^1A1g→^3T2g
	𝜈1 6535 (cal.)	^4A2→^4T2		487.3	6091	4.21	Tetrahedral	34.3*
C6a	𝜈2 10526	^4A2→^4T1	1.25
Co(II)	𝜈3 16666	^4A2→^4T1(P)	(0.501)
	𝜈4 21551	L→M(C.T)
	𝜈1 6389 (cal.)	^4A2→^4T2		488.5	6107	4.30	Tetrahedral	30.52*
C6b	𝜈2 10504	^4A2→^4T1(F)	1.25
Co(II)	𝜈3 16612	^4A2→^4T1(P)	(0.503)
	𝜈4 20876	L→M(C.T)
	𝜈1 5473 (cal.)	^3T1(F)→^3T2(F)		721.5	5768	2.73	Tetrahedral	7.9*
C7	𝜈2 11074	^3T1(F)→^3A2(F)	0.82
Ni(II)	𝜈3 15873	^3T1(F)→^3T1(P)	(0.70)
	𝜈4 18867	L→M(C.T)
C8	𝜈1 13440	^2B1g→^2A1g				1.84	Square planar	155.8
Cu(II)	𝜈2 19230	^2B1g→^2B2g
C9	𝜈1 16949	^1A1g→^1A2g				Diamagnetic	Square planar	125.4
Pd(II)	𝜈2 21367	^1A1g→^1B1g(C.T)
C10	𝜈1 14388	^1A1g→^3T1g				Diamagnetic	Octahedral	196.6
Pt(IV)	𝜈2 20576	^1A1g→^3T2g(C.T)
C11a	𝜈1 6410 (cal.)	^4A2→^4T2	1.5	436.8	6552	3.959	Tetrahedral	143.5
Co(II)	𝜈2 10000	^4A2→^4T1(F)	(0.449)
	𝜈3 15641 (avr.)	^4A2→^4T1(P)
C11b	𝜈1 6410 (cal.)	^4A2→^4T2	1.5	436.8	6552	3.997	Tetrahedral	150.6
Co(II)	𝜈2 10000	^4A2→^4T1(F)	(0.449)
	𝜈3 15641 (avr.)	^4A2→^4T1(P)
C12	𝜈1 4994 (cal.)	^3T1(F)→^3T2(F)	0.74	673.1	4980	2.746	Tetrahedral	159.4
Ni(II)	𝜈2 10482	^3T1(F)→^3A2(F)	(0.653)
	𝜈3 15483 (avr.)	^3T1(F)→^3T1(P)
C13	𝜈1 12820	^1A1g→^1A2g				Diamagnetic	Square planar	148.2
Pd(II)	𝜈2 16666	^1A1g→^1B1g