Chelate polymer compounds with bis(bidentate) ligand: synthesis, spectral, morphological and thermal degradation studies

Figures & data

Figure 1 The structure of divalent transition metal chelate polymer compounds

Scheme 1 Keto-enol tautomerism and covalent mode of ibpmpc in polymer compounds during polymerisation

Scheme 2 Coordination mode of ibpmpc in polymer compounds

Figure 2 Diffuse reflectance spectra of chelate polymer compounds

Table 1 Solubility of ibpmpc chelate polymer compounds in various solvents

	Solvents
Ligand/polymers	DMF	DMSO	CHCl3	CCl4	C6H6	DMAc	DCE	C2H5OH	H2SO4	HCl
ibpmpc	++	++	−	−	−	+	±h	+	+	+
Mn(II)	−	−	−	−	−	−	−	−	+	+h
Co(II)	−	−	−	−	−	−	−	−	+	+h
Ni(II)	−	−	−	−	−	±h	−	−	+h	+h
Cu(II)	−	±h	−	−	−	±h	−	−	+	+h

Figure 3 SEM images of chelate polymer compounds (a) Mn (II), (b) Co (II), (c) Ni (II) and (d) Cu (II)

Table 2 Thermal behaviour data of ibpmpc chelate polymer compounds

	TG
Polymers	^a T i	^b T max	^c T f	^d T h	^e T 5%	^f T 10%	^g T 20%	^hChar Yield%	^iLOI
Mn(II)	283	121,298,993	993	520	96.88	198	279	87.1	52.3
Co(II)	281	111,381,937	942	512	59.76	97.8	288	87.4	52.4
Ni(II)	285	300,455,1002	1037	535	70.80	112	286	87.3	52.4
Cu(II)	310	232,352,1114	1110	965	102.46	205	397	85.4	51.6

Table 3 TG/DTG/DTA data and assignments of ibpmpc chelate polymer compounds

		DTGmax	Temperature	DTA(T DTA)		Weight loss
Polymers	Step	T DTG	range (°C)	Endo	Exo	Obs/calc	Assignment
Mn(II)	1st	69,115	40–145	122	–	6.7/6.1	−2H2O (lattice water)
	2nd	200	145–272	182	–	6.0/6.1	−2H2O (coord. water)
	3rd	298	283–700	297	326	47.8/47.2	−60% ligand
	4th	578,989	700–1216	887	–	26.6/28.1	−40% ligand
	Residue of MnO
Co(II)	1st	62,111	40–140	65.11	–	5.5/6.0	−2H2O (lattice water)
	2nd	243,299	145–270	266	–	6.3/6.0	−2H2O (coord. water)
	3rd	384,512	281–600	387,489	507	29.9/31.2	−40% ligand
	4th	796,918	600–1216	855,891	1100	45.7/46.9	−60% ligand
	Residue of CoO
Ni(II)	1st	65	28–130	112	–	5.8/6.0	−3H2O (lattice water)
	2nd	209	150–226	292	–	5.9/6.1	−2H2O (coord water)
	3th	336,1037	285–1219	451,661	1200	75.6/75.9	−100% ligand
	Residue of NiO
Cu(II)	1st	86	40–150	–	–	6.3/6.0	−2H2O (lattice water)
	2nd	222	150–280	200	–	6.4/6.0	−2H2O (coord water)
	3rd	334,526	310–800	700	354	35.3/34.9	−45% ligand
	4th	1062,1110	800–1219	961,1065	–	37.4/42.6	−55% ligand
	Residue of CuO

Figure 4 TG/DTG thermograph of chelate polymer compounds (a) Mn (II) and (b) Co (II) at a heating rate of 10ºC min⁻¹ in nitrogen atmosphere

Figure 5 TG/DTG thermograph of chelate polymer compounds (a) Ni (II) and (b) Cu (II) at a heating rate of 10ºC min⁻¹ in nitrogen atmosphere

Figure 6 Decomposition temperature of chelate polymer compounds vs. atomic number

Figure 7 Reciprocal of ionic radii of divalent metal ions vs. atomic number