Table 1.

Mass spectroscopic data of ligands and compounds.

(A) Reduced Schiff base, K[Sal-L-tryp), and compounds 1-4.
Species	Exact Mass [g mol-1]	Species formed in the spectrometer	m/z	Relative Intensity
Reduced Schiff base #	310.13	[M + H]+	311.08	100.00
		[M − CHO3 + H]+	242.42	13.04
		[2M + H]+	620.36	12.77
		[3M + H]+	930.39	5.02
		[4M + H]+	1240.92	3.92
K[(Sal-L-tryp)] #	346.07	[M + H]+	344.05	39.65
		[M − OH − K + H]+	300.03	100.00
		[M − OH − O − K + H]+	205.20	50.43
		[M − COO − K + H]+	242.62	64.65
		[M − COO − OH − K + H]+	262.12	1.51
		[M − C7H6O − K + H]+	281.14	46.08
[VO(Sal-L-tryp)(MeATSC)] #	666.14	[M + H]+	666.17	100.00
		[M − C2H5N2S + H]+	577.08	33.10
		[M − C17H17N3 + H]+	405.14	31.86
		[MeATSC + H]+	292.14	54.60
[VO(Sal-L-tryp)(N-Ethhymethohcarbthio)] †	626.13	[M − H]-	624.87	100.00
		[M − C11H10N2O − H]-	431.90	64.75
		[M − C11H15N3O2S - H]-	407.85	20.99
		[[C11H15N3O2S − C8H7N] − H]-	287.88	12.70
		[N-Ethhymethohcarbthio − H]-	252.00	25.74
[VO(Sal-L-tryp)(acetylethTSC)] #	601.09	[M + H]+	600.25	2.71
		[M − C3H7NS + H]+	513.57	100.00
		[M − C7H5NO + H]+	482.38	37.11
		[M − C17H15N2O + H]+	336.06	4.13
(B) Oxidised products isolated from compounds 1 and 3.
Species	Exact Mass [g mol-1]	Species formed in the spectrometer	m/z	Relative Intensity
Proposed [VO(Sal-L-tryp)(DMSO)(OH)] a, # intermediate	468.06	[M + H]+	468.60	1.67
		[M − OH − DMSO − C8H7N + H]+	242.41	100.00
		[M − OH + H]+	451.05	48.25
		[[V2O3(Sal-L-tryp)2] + H]+	763.68	30.06
		[[V2O3(Sal-L-tryp)2(H2O)] + H]+	776.77	49.36
		[[V2O3(Sal-L-tryp)2(DMSO)2] + H]+	918.28	3.13
Proposed [VO(Sal-L-tryp)(DMSO)(OH)] b, # intermediate	468.06	[M + H]+	470.01	0.50
		[N-Ethhymethohcarbthio + H]+	252.26	100.00
		[M − OH + H]+	451.96	2.97
		[M − OH + N-Ethhymethohcarbthio + H]+	702.75	2.15
		[[V2O3(Sal-L-tryp)2 + H]+	763.22	0.74
		[[V2O3(Sal-L-tryp)2(H2O)] + H]+	775.40	1.08
		[[V2O3(Sal-L-tryp)2(DMSO)2] + H]+	916.44	0.75

^#positive mode

^†negative mode

^aproposed vanadium(V) intermediate obtained from compound 1

^bproposed vanadium(V) intermediate obtained from compound 3