Chapter 4 RESULT AND DISCUSSION 4 1 Physical study Solubility melting point physical state of ligands can be seen in Table 5 1 The ligand HPDC is brown powder in color and soluble in water methanol and chloroform but insoluble in carbon tetra chloride and n hexane Melting point of ligand HPDC is 160oC The ligand HPDP is also brown powder in color and soluble in methanol chloroform and carbon tetra chloride but insoluble in water and n hexane While the melting point of ligand HPDP is 180oC The ligand DCDHS is black in color and soluble in water methanol but insoluble in chloroform carbon tetrachloride and n hexane Melting point of ligand HCDHS is 300oC The ligand HPDHS is also black in color soluble in water methanol but insoluble in chloroform carbon tetrachloride and n hexane Melting point of ligand HClPD is 280oC All ligands were treated with Co Zn Ni Mn salts to form Co II Mn II Zn II Ni II complexes
The physical properties such as solubilities melting points colors states of Co Zn Ni Mn complexes are described in Tables 5 3 5 4 and 5 5 4 2 FTIR study The synthesized ligands have different functional group The detailed interpretation of IR spectra of these ligands are indicated the formation of ligand as the absence of NH2 peak at 3500 3100 cm 1 appearance of N N peak at 1400 1450 cm 1 carbonyl group C O gave asymmetric and symmetric peaks at 1700 1600 cm 1 O H stretching peak at 3650 3600 cm 1 and C H sp2 at 3150 3050 cm 1 Appearance of O H stretching peak confirm that enol tautomeric form is dominant FTIR data of all the ligands are given in Table 5 6 4 2 1 3 hydroxy 2 E 2 hydroxyphenyl diazenyl cyclohexanone
HPDC O H peak appears at 3650 cm 1 the C H stretch aromatic peak appears at 3056 cm 1 N N peak appears at 1448 cm 1 C N peak appeared at 1250 cm 1 while C O peak appears at 1659 cm 1 The appearance of OH peak confirmed the formation of compound HPDC which was absent in the FTIR spectrum of reactants The FTIR spectrum of the ligand HPDC given in Fig 5 1 4 2 2 4 hydroxy 3 E 2 hydroxyphenyl diazenyl pentan 2 one HPDP O H peak appears at 3650 cm 1 the C H stretch aromatic peak appears at 3056 cm 1 N N peak appears at 1477 cm 1 C N peak appeared at 1250 cm 1 while C O peak appears at 1155 cm 1 the C H stretch aliphatic peak appears at 3056 cm 1 The appearance of OH peak confirmed the formation of compound HPDP which was absent in the FTIR spectrum of reactants The FTIR spectrum of the ligand HPDP given in Fig 5 2 4 2 3 3 hydroxy 4 E 2 hydroxy 6 oxocyclohexyl diazenyl naphthalene 1 sulfonic acid DCDHS O H peak appears at 3649 cm 1 the C H stretch aromatic peak appears at 3056 cm 1 N N peak appears at 1491 cm 1 C N peak appeared at 1250 cm while C O peak appears at 1675 cm 1 The peak of SO2 appeared at 1050 cm 1
The appearance of OH peak confirmed the formation of compound HCDHS which was absent in the FTIR spectrum of reactants The FTIR spectrum of the ligand HCDHS given in Fig 5 3 4 2 4 3 hydroxy 4 E 2 hydroxy 4 oxopentan 3 yl diazenyl naphthalene 1 sulfonic acid DPDHS O H peak appears at 3650 cm 1 the C H stretch aromatic peak appears at 3056 cm 1 N N peak appears at 1498 cm 1 C N peak appeared at 1250 cm 1 while C O peak appears at 1675 cm 1 The S O peak appears at 1050 cm 1 The appearance of OH peak confirmed the formation of compound DPDHS which was absent in the FTIR spectrum of reactants The FTIR spectrum of the ligand DPDHS given in Fig 5 4 FTIR study of metal complexes FTIR data of all the complexes of ligands are given in Table The important peaks of C O and C N were observed at 1650 cm 1 s and 1250 cm 1 m w which are at low field as compare to the peaks observed in ligands spectra The shifting is due to the ligation of OH and C N to the metal atom The peak of metal 700 cm 1 gives another strong indication of formation of metal ligand bond On the basis of IR data it is concluded that the complexes have octahedral geometry as shown in fig 4 1 FTIR spectra of all ligand metal complexes are given in fig 5 5 to 5 24 M 2 Co 2 Ni 2 Zn 2 Mn 2 Fig 4 1 Purposed structure of metal complex
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