Isomerismo cis-trans: de Werner aos nossos dias

Abstract

Recebido em 17/9/96; aceito em 17/9/97 CIS-TRANS ISOMERISM: FROM WERNER TO THE PRESENT DAYS: In coordination chemistry the study of geometrical isomerization and reactivity of specific isomers is a topic of major importance. The preparation of specific isomers often requires considerable complexity, and it is important to acquire a sense of what is involved in studying isomerism in laboratory. If it is difficult sometimes to prepare pure isomers, it is not easier to understand the mechanisms of isomerization reactions since studies on this subject have shown conflicting results and diferent interpretations on the same system have been reported in the literature. Although cis-trans isomerism in octahedral metal complexes is a common occurrence, there are relatively few studies reporting how these isomerizations occur. This paper gives an overview on cis-trans isomerization processes and identification of these species.

Obtenção de complexos de Pt(II) e Pd(II) derivados de 1,3,4-oxadiazol-2-(3H)-tiona e 5-amino-1,3,4-tiadiazol-2-tiol: potencial antitumoral de dois complexos de Pt(II) contendo 1,10-fenantrolina

“…A importância da técnica de RMN de 195 Pt se deve à sua capacidade de fornecer informações referentes à esfera de coordenação ao redor da platina, a pureza dos complexos, bem como o estado de oxidação e estereoquímica em torno do íon metálico (DE OLIVEIRA, Leticia P. et al, 2018;GABANO et al, 2006) -JIBORI et al, , 2012GRANT et al, 2002;QUEIROZ;BATISTA, 1998 322,8541 1511,9678 512,0336 6c/Å 20,2890 58,0984 616,1510 618,5414 11α/° 90 90 90,4970 10103,342 2β/° 104,1466 (17) 103,369 ( Fonte: Dados da Pesquisa.…”