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Table 5 Experimental data of the λmax for the investigated PAP azo dyes and their chelates at the recommended pH values

From: Physico-analytical studies on some heterocyclic azo dyes and their metal complexes with some transition metals

Dye

λnm

λnm

λnm

λnm

a

b

c

Δ λnm

a

b

c

Δ λnm

a

b

c

Δ λnm

a

b

c

Δ λnm

 

Co(II)

Ni(II)

Cu(II)

Zn(II)

Ia

439

580

587

141

430

502

525

72

422

540

544

118

429

510

530

81

Ib

428

540

557

112

428

488

499

60

428

533

546

105

428

477

508

49

  1. awavelength of the dye using water as a blank
  2. bwavelength of the chelate using water as blank
  3. cwavelength of the chelate using the dye as a blank (1:1)
  4. dwavelength of the chelate using the dye as a blank (1:2)
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BMC Chemistry

ISSN: 2661-801X

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