Thermal Dehydration and Decomposition Reactions of Bivalent Metal Oxalates in the Solid State

Nagase, Kenzo; Sato, Katsuya; Tanaka, Nobuyuki

doi:10.1246/bcsj.48.439

Cited by 67 publications

(21 citation statements)

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“…The plot of initiation temperature of thermal decomposition of the metal complexes against the corresponding reciprocal ionic radii (Fig. 5, Table 5) exhibit some definite trends [21]. This behaviour is close to the general behaviour of gradual decrease of the stability of metal complexes with a decrease in the ionic radii.…”

Section: Josupporting

confidence: 70%

Structural and thermal decomposition characteristics of mixed-ligand complexes of Cu(II), Ni(II), Co(II) and Zn(II)

Rajesh

Sharma

1990

Journal of Thermal Analysis

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Mixed-ligand complexes of Cu(II), Ni(II), Co(II) and Zn(II) with 8-hydroxyquinoline and thiophene-2-carboxylic acid as two different ligands, have been isolated in pure state. The formation of these complexes has been inferred potentiometrically. The isolated complexes have been characterized by their elemental analyses, IR and electronic spectra, conductivity and magnetic measurements. Solid state dehydration of the hydrated complexes and sub-'sequent decomposition of the anhydrous complexes have been studied by simultaneous DTA and TG techniques. The thermal stability order of the hydrated compounds is Cu > Co > Ni > Zn, but in the decomposition process the trend observed is Co > Zn > Ni > Cu. Some parameters like activation energy and order of reaction for each process have been computed.Antifungal antibacterial properties of some mixed-ligand complexes of transition and inner-transition metal ions have been reported [1,2] in the literature. The compounds containing nitrogen and sulphur atoms play an important role in many process of biological importance [3]. 8-hydroxyquinoline and its derivatives have long been used as potential antimicrobiol agents and drugs [4,5]. The role of mixed-ligand complexes in biological process has well recognized [6]. In the present communication, synthesis, structural and thermal decomposition characteristics of the aforesaid mixedligand chelates have been discussed with a view to study their stability behaviour.

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Section: Josupporting

confidence: 70%

Structural and thermal decomposition characteristics of mixed-ligand complexes of Cu(II), Ni(II), Co(II) and Zn(II)

Rajesh

Sharma

1990

Journal of Thermal Analysis

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“…The reciprocal of the ionic radii of the divalent metal ions increases from Co(II) to Cu(II) with the increase of initial temperatures of decomposition, while the reciprocal of the ionic radii decreases from Co(II) to Zn(II) and the thermal stabilities of these complexes also decreases. Consequently, it is evident that the thermal stabilities of the complexes increase as the ionic radii of the metal decrease [18,19].…”

Section: +mentioning

confidence: 99%

Studies on thermal degradation of oligo-2-[(4-morpholin-4-yl-phenyl)imino methyl] phenol and oligomer–metal complex compounds

Doğan

Kaya

2007

Designed Monomers and Polymers

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Abstract-Thermogravimetric studies of 2-[(4-morpholin-4-yl-phenyl) imino methyl]phenol (2-MPIMP), oligo-2-[(4-morpholin-4-yl-phenyl) imino methyl] phenol (O-2-MPIMP) and its oli-gomer-metal complex compounds were investigated by thermal analysis. Four kinetic methods were used to investigate the thermal decomposition of these materials. These investigated methods are those of Coats and Redfern (CR), MacCallum and Tanner (MC), van Krevelen (vK) and Madhusudanan, Krishnan and Ninan (MKN). The values of the apparent activation energies of thermal decomposition E a , the reaction order n, pre-exponential factor A, the entropy change S * , enthalpy change H * , free energy change G * , obtained by the above-mentioned methods were all in good in agreement with each other. It was found that the thermal stabilities of the complexes follow the order Cu(II) > Co(II) > Zn(II) > Zr(IV) > Pb(II) > Cd(II).

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“…(1) occurs when the metal is an alkali metal or alkaline earth metal, excepting Be and Mg [40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55].…”

Section: (2) (3)mentioning

confidence: 99%

Activation energy of thermal decomposition of fully dehydrated NdC2O4Cl·3H2O to NdOCl

Mulokozi

Zuru

1989

Journal of Thermal Analysis

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An activation energy Ea = 195 kJ mol-1 has been determined for the thermal decomposition of NdC204C1 to NdOCI with simultaneous expulsion of CO and CO2. As compared with the value (127 kJ mo1-1) predicted by the Kahwa-Mulokozi empirical expression (i) + for Ln2(C204)3 (Ln = light lanthanide), the presence of C1-in the coordination polyhedron appreciably raises the activation energy, which is consistent with a corresponding increase in the covalent strength of the Ln-oxalate bond. The same conclusion regarding the strength of this bond is drawn from a study of the infrared spectrum.Mechanistically, the breaking of the Ln-oxalate bond is suggested to occur in the kinetic ratedetermining step.The thermal decomposition behaviour of the lanthanide oxalates and their derivatives LnC204X (X = C1 or Br) has been widely investigated [1-37]. The course of the reaction displays pronounced sensitivity to the nature of the bonding, not only with regard to the metal-oxalate interaction, but also as concerns the donor property of X. Those observations are explained in a neat theoretical framework. decomposition of oxalate can proceed via three alternativeThe thermal pathways:

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Thermal Dehydration and Decomposition Reactions of Bivalent Metal Oxalates in the Solid State

Cited by 67 publications

References 1 publication

Structural and thermal decomposition characteristics of mixed-ligand complexes of Cu(II), Ni(II), Co(II) and Zn(II)

Structural and thermal decomposition characteristics of mixed-ligand complexes of Cu(II), Ni(II), Co(II) and Zn(II)

Studies on thermal degradation of oligo-2-[(4-morpholin-4-yl-phenyl)imino methyl] phenol and oligomer–metal complex compounds

Activation energy of thermal decomposition of fully dehydrated NdC2O4Cl·3H2O to NdOCl

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