Thermal decomposition of metal complexes with thioureas

Bailey, R. A.; Tangredi, W.J.

doi:10.1016/0022-1902(76)80198-4

Cited by 15 publications

(5 citation statements)

References 18 publications

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“…Moreover, a complete CdLC1, (L = urea, and N,N'-di-X-ray diffraction pattern for Cd(mu)Cl, illustrates methylurea) adducts by therm~~ravimetric analyan interesting structure (3) where the metal is sis in air and vacuum, the following order of octahedrally coordinated, with the participation of stability was established: urea > methylurea > methylurea as a monodentate ligand. This polymer N,Nf-dimethylurea (6). his sequence clearly instructure shows one site of coordination occupied dicates an influence of ligand substituents on stabilby oxygen of the ligand carbonyl with the other ity.…”

Section: Introductionmentioning

confidence: 89%

Thermochemical study of adducts of methylurea with zinc, cadmium, and mercury halides

Airoldi¹,

Chagas²,

Assunção³

1982

Can. J. Chem.

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CLAUDIO AIROLDI, AECIO P. CHAGAS, and FRANCISCO P. A s s u~q i o .Can. J. Chem. 60,2132Chem. 60, (1982. The adducts Zn(mu),X, (X = CI, Br), M(mu)X, (M = Cd, Hg and X = CI, Br) have been characterized. The CO and NH stretching frequencies indicate that methylurea (mu) is bound to metals through oxygen. Enthalpies of dissolution of the adducts in ethanol or methanol have been measured calorimetrically. Combination with the enthalpies of solution of metal halides and ligand in the same solvents at 298.15 K yielded the standard enthalpy (AH,e/kJ mol-I) for the reaction: MX,(s) + nmu(s) -t M(mu),,X, (s):Zn(mu),Cl,, (-36.27k0.51); Zn(mu),Br,, (-37.52k0.97); Cd(mu)CI,, (-22.78k0.26); Cd(mu)Br,, (-9.58k0.26); Hg(mu)Cl,, (-13.91k 0.41); and Hg(mu)Br,, (-13.29k0.48). The standard enthalpies of formation of theadducts in the same sequence as above, AH,e (s, 298.15 K): -1024, -938, -70 1, -612, -524, and -470 kJ mol-', were determined from these values, the standard enthalpy of the ligand (-285k 15 kJ mol-I) being obtained via combustion calorimetry, and literature values of the standard enthalpies of metal halides being used. With the determination of the standard enthalpy of sublimation of the ligand (78.2 kJ mol-I) it was possible to determine the standard enthalpies of the reactions MX,(g)The enthalpies of metal-oxygen bonds were also estimated. Introductioninfrared studies methylurea has a nearly planar Our interest in the thermochemistry of adducts configuration of the N-C(ObN moiety with the of halides of the zinc family with urea derivatives as C-N bonds possessing appreciable double bond ligand is now focused on methylurea (mu). The character and a tendency to form hydrogen bonds determinations of crystallographic parameters for (4). It can act as a ligand utilizing either nitrogen or Cd(mu),,X, (X = C1, Br, I and n = 1, 2) and Oxygen as the d~n o r atomZn(rnu),Br, were the pioneer studies involvingFrom the results on thermal decomposition of methylurea as a ligand (1,2). Moreover, a complete CdLC1, (L = urea, and N,N'-di-X-ray diffraction pattern for Cd(mu)Cl, illustrates methylurea) adducts by therm~~ravimetric analyan interesting structure (3) where the metal is sis in air and vacuum, the following order of octahedrally coordinated, with the participation of stability was established: urea > methylurea > methylurea as a monodentate ligand. This polymer N,Nf-dimethylurea (6). his sequence clearly instructure shows one site of coordination occupied dicates an influence of ligand substituents on stabilby oxygen of the ligand carbonyl with the other ity. This is the only thermochemical datum dealing positions being occupied by chloride bridges.with the methylurea ligand. The coordination characteristic of methylurea is In Our study, the Zn(mu)*X, (X = C 1 j Br) and expected to be the same as that of N,N'-M(mu)X, (M = Cd, Hg and X = C1, Br) adducts dimethylurea (dmu) where both molecules resem-were synthesized and characterized, with special ble the urea molecule (4, 5 ) in structure. prom concern being devoted to ...

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Section: Introductionmentioning

confidence: 89%

Thermochemical study of adducts of methylurea with zinc, cadmium, and mercury halides

Airoldi¹,

Chagas²,

Assunção³

1982

Can. J. Chem.

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“…Several transition metal pyridine-thiocyanate complexes were examined by TG, DTG, and DTA (256), where it was shown that Mn and Ni complexes exhibit two-step depyridination, while Cu and Zn show only one. Transition metal complexes with methyl and dimethyl urea were subject to TG in air and vacuum (18) and TG and DTA were applied to Na2[Fe(CN)5N2H5]-2H20 (184) and the decomposition products of these materials were identified. Simultaneous TG-DTG-DTA, as well as TG in the isothermal mode, were applied to cis-[CrCl2tn]Cl-0.5H2O (tn = trimethylenediamine) (381).…”

Section: Thermogravimetrymentioning

confidence: 99%

Thermal analysis

Murphy¹

1978

Anal. Chem.

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“…In spite of literature reports on the thermal analysis investigations of thioureametal ion complexes, publications on the thermal behaviour of these individual materials are very scarce [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of thione compounds

Marco

Bucci²,

Gallo

1993

Journal of Thermal Analysis

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The thermal behavior of thiourea (Tu), N, N, N', was investigated by means of conventional thermal analysis in Oz and N2 and IR spectroscopy of the residues on heating in air at various temperatures.At ordinary pressure, the compounds are thermally stable up to the melting points. After melting, they show high vapor pressure, combustion in 02 atmosphere and isomerization to ammonium thioeyanate, with the exception of Me4Tu.

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Thermal decomposition of metal complexes with thioureas

Cited by 15 publications

References 18 publications

Thermochemical study of adducts of methylurea with zinc, cadmium, and mercury halides

Thermochemical study of adducts of methylurea with zinc, cadmium, and mercury halides

Thermal analysis

Thermal analysis of thione compounds

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