Table 1

S.No	Compounds	Color	Shape	Yield %	M.P°C	UV-Vis (λ_maxnm)
1	C_₁	White	Crystal	80	255	298
2	C_₂	White	Crystal	71	220	283
3	C_₃	White	Crystal	75	248	292
4	C_₄	White	Crystal	73	240	288

Table 1: UV-Vis spectrum and physical properties of imidazolecarboxaldehyde semicarbazone (C₁-C₄)

Table 2

S.No	Compounds	ν(NH_₂) cm^{^-1}	ν(NH)cm^{^-1}	ν(HC=N) cm^{^-1}	ν(C=O) cm^{^-1}	ν(N-N) cm^{^-1}
1	C_₁	3464, 3445	3140	1584	1690	1116
2	C_₂	3382, 3323	3217	1592	1655	1109
3	C_₃	3294, 3256	3093	1541	1640	1159
4	C_₄	3471, 3309	3147	1579	1691	1120

Table 2: Infrared spectral data of imidazolecarboxaldehyde semicarbazone (C₁-C₄)

Table 3

S.No	Compounds	δ(C-H)_{_ring}	δ(HC=N)	δ(NH_₂)	δ(NH)	δ(N-H)_ring	δ(-CH_₃)
1	C_₁	7.6-0.0	7.8	6.4	10.0	12.1	2.2
2	C_₂	7.3-7.8	7.8	6.4	10.2	12.4	-
3	C_₃	6.9-7.3	7.9	6.4	10.3	-	3.8
4	C_₄	7.3-7.7	7.9	6.3	10.2	-	3.9

Table 3: ¹H NMR spectral data (ppm) of Imidazolecarboxaldehyde semicarbazone (C₁-C₄)

Table 4

S.No	Compounds	δ(HC=N)	δ(C=O).	δ(2C-H) ring	δ(Cq ring);	δ(CH₃)
1	C_₁	135.54	156.93	-	-	-
2	C_₂	129.79	157.03	128.70-129.45	136.89	-
3	C_₃	132.75	156.43	124.76-128.32	141.40	35.5
4	C_₄	132.26	156.66	127.36-130.78	141.24	33.87

Table 4: ¹³C-NMR spectral data (ppm) of Imidazolecarboxaldehyde semicarbazone (C₁-C₄)

Tables at a glance

Table 1

Table 2

Table 3

Table 4

Figures at a glance

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Scheme 1

Scheme 1: Synthesis of 4-methyl-5-imidazolecarboxaldehyde semicarbazone (C1)

Scheme 2

Scheme 2: Synthesis of 4-imidazolecarboxaldehyde semicarbazone (C₂)

Scheme 3

Scheme 3: Synthesis of 1-methyl-2-imidazolecarboxaldehyde semicarbazone (C₃)

Scheme 4

Scheme 4: Synthesis of 1-methyl-5-imidazolecarboxaldehyde semicarbazone (C₄)

FIGURE 1

Figure 1: IR spectrum of 4-methyl-5-imidazolecarboxaldehyde semicarbazone (C₁)

FIGURE 2

Figure 2: IR spectrum of 4-imidazolecarboxaldehyde semicabazone (C₂)

FIGURE 3

Figure 3: IR spectrum of 1-methyl-2-imidazolecarboxaldehyde semicarbazone (C₃)

FIGURE 4

Figure 4: IR spectrum of 1-methyl-5-imidazolecarboxaldehyde semicarbazone (C₄)

FIGURE 5

Figure 5: UV-Vis spectrum of 4-methyl-5-imidazolecarboxaldehyde semicarbazone (C1)

FIGURE 6

Figure 6: UV-Vis spectrum of 4-imidazolecarboxaldehyde semicabazone (C₂)

FIGURE 7

Figure 7: UV-Vis spectrum of 1-methyl-2-im idazolecarboxaldehyde semicarbazone (C₃)

FIGURE 8

Figure 8: UV-Vis spectrum of 1-methyl-5-imidazolecarboxaldehyde semicarbazone (C₄)

FIGURE 9

Figure 9: ¹H NMR spectrum of 4-methyl-5-imidazolecarboxaldehyde semicarbazone (C₁)

FIGURE10

Figure 10: ¹³C NMR spectrum of 4-methyl-5-imidazolecarboxaldehyde semicarbazone (C₁)

FIGURE11

Figure 11:¹H NMR spectrum of 4-imidazolecarboxaldehyde semicabazone (C₂)

FIGURE12

Figure 12:¹³C NMR spectrum of 4-imidazolecarboxaldehyde semicabazone (C₂)

FIGURE13

Figure 13: ¹H NMR spectrum of 1-methyl-2-imidazolecarboxaldehyde semicarbazone (C₃)

FIGURE14

Figure 14: ¹³C NMR spectrum of 1-methyl-2-imidazolecarboxaldehyde semicarbazone (C₃)

FIGURE15

Figure 15: ¹H NMR spectrum of 1-methyl-5-imidazolecarboxaldehyde semicarbazone (C₄)

FIGURE16

Figure 16: ¹H NMR spectrum of 1-methyl-5-imidazolecarboxaldehyde semicarbazone (C₄)