Sample records for thioureas
from WorldWideScience.org

Sample records 1 - 2 shown.



1

Estimativa por DSC das entalpias de sublimação da etilenouréia e da propilenouréia: algumas correlações empíricas envolvendo amidas e tioamidas/ Estimative by DSC data of the sublimation enthalpies for ethyleneurea and propyleneurea: some empirical correlations with amides and tioamides

Farias, Robson Fernandes de
1999-07-01

Resumo em inglês By using DSC data, the enthaplies of sublimation for ethyleneurea and propyleneurea, are calculated as 84 and 89 kJ mol-1 respectively. Using the vaporization enthalpy values for dimethylethyleneurea and dimethylprophyleneurea, as obtained from literature, the empirical relation: Dcrg Hmo (1)/ Dcrg Hmo (2) = Dlg Hmo (1)/ Dlg Hmo(2) = constant, that relate sublimatio (mais) n or vaporization enthalpies of two different substances and of its methylated derivatives, is obtained. Correlations like that are found to another ureas and thioureas.

Scientific Electronic Library Online (Portuguese)

2

Compostos heterometálicos. Interação do tricarbonil com ligação W-Hg, [WCl(CO)3(bipy)(HgCl)], com tiouréias/ Heterometallic compounds. Interaction of the tricarbonyl containing W-Hg bond, [WCl(CO)3(bipy)(HgCl)], with thioureas

KAZUKO MURAOKA, Tereza; MAURO, Antonio Eduardo; MARTINS NOGUEIRA, Vânia; HADDAD, Paula Silvia
1997-01-01

Resumo em português Foram efetuadas reações entre o heterometálico [WCl(CO)3(bipy)(HgCl)], (bipy = 2,2'-bipiridina) e tiouréias que levaram à formação de compostos do tipo [WCl(CO)3(bipy)(HgCl)L] [L = tiouréia (tu); N-metiltiouréia (mtu); N,N-dimetiltiouréia (dmtu)]. Os espectros de absorção no infravermelho mostram que a esfera de coordenação do tungstênio mantêm-se inalterada e que as tiouréias encontram-se ligadas ao átomo de mercúrio através do átomo de enxofre. Resumo em inglês Reactions of [WCl(CO)3(bipy)(HgCl)], [bipy = 2,2’-bipyridine], with thioureas were performed giving compounds of the type [WCl(CO)3(bipy)(HgCl)], [L= thiourea (tu); N-methylthiourea (mtu); N,N-dimethylthiourea (dmtu)] in which the coordination sphere of the tungsten atom remained unchanged. The coordination of the thioureas to mercury atom was proved to occur, in accord to infrared spectra, through the sulphur atom.

Scientific Electronic Library Online (Portuguese)