|
|||||
|
|
Syntheses and properties of organocyanamide, cyanoguanidine and dinitrogen complexes of rhenium. Crystal structure of mer-[ReCl2(NCNEt2) (PMePh2)3] |
|
| Authors: | M. Teresa A. R. S. Costa, Jo o J. R. Fraú sto da Silva, Armando J. L. Pombeiro, Rino A. Michelin, Gabriella Bombieri,Franco Benetollo |
| Affiliation: | a Centro de Química Estructural, Complexo I, Instituto Superior Técnico, Av. Rovisco Pais, 1096, Lisbon codex, Portugal b Dipartimento di Processi Chimici dell'Ingegneria, via Marzolo 9, Università di Padova, 35131, Padua, Italy c Istituto di Chimica Farmaceutica, Università di Milano, viale Abruzzi 42, 20131, Milan, Italy d Istituto di Chimica e Tecnologica dei Radioelementi del CNR, Corso Stati Uniti 4, 35020, Padua, Italy |
| Abstract: | Treatment of a THF solution of trans-[ReCl(N2)L4] (L = PMePh2) with a cyanamide, NCNR2 (R = Me, Et or H) or with cyanoguanidine, NCNC(NH2)2 , yields mer-[ReCl(N2)(NCNR2)L3] (1) or mer-[Re(N2)[Re(N2){NCNC(NH2)2}2L3]Cl (2), respectively, which, to our knowledge, are the first mixed dinitrogen-cyanamide-type complexes to be reported. The former products (1, R=Me or Et) can also be obtained from reaction of the benzoyldiazenido complex [ReCl2(NNCOPh)L3] with NCNR2 in refluxing methanol; the Re(II) complex mer-[ReCl2(NCNEt2)L3] (3) is also formed (conceivably via an unusual homolysis of the C---N bond of the benzoyldiazenido ligand) and its crystal structure is reported. It shows an unusual pyramidal conformation at the amine N atom of the diethylcyanamide ligand which also exhibits a significant structural trans influence on the phosphine, behaving as a stronger net electron donor than the latter ligand. |
| Keywords: | Crystal structures Rhenium complexes Dinitrogen complexes Cyanamide complexes Cyanoguanidine complexes |
| 本文献已被 ScienceDirect 等数据库收录！ | |