Studies of β-Diketone Complexes of Rhenium. I. Trispentane-2,4-dionatorhenium(III) and Tris(1,1,1,5,5,5-hexafluoropentane-2,4-dionato)rhenium(III)

Abstract

Pure samples2 of Re(hfac), and Re(acac), have been prepared and their physical properties studied by ultraviolet-visible and infrared spectroscopy, mass spectrometry, magnetic susceptibility measurements, and X-ray diffraction. The compounds are monomeric and the physical properties may be explained if the rhenium atom sits in an essentially octahedral ligand field. Re(hfac), has a hexagonal unit cell and the acetylacetone complex adopts the monoclinic cell of the a-form of the three typical crystal structure types which Astbury (1) observed for trispentane-2,4-dionatometal(II1) compounds. The properties observed for trispentane-2,4-dionatorhenium(lI1) differ from those reported previously (2, 3). The difficulties experienced in obtaining pure Re(C5H702), were caused by the ease with which the material is oxidized.On a prCparC des Cchantillons purs2 de Re(hfac), et Re(acac), et ttudit leurs proprittts physiques par la spectroscopie ultraviolette-visible et infrarouge, la spectrometric de masse, des mesures de susceptibilitt magnttique et la diffraction de rayons-)<. Les composes sont monomeriques et on peut expliquer ies proprittts physiques si I'atome de rhenium se trouve dans un champ de ligand essentiellement octatdrique. Re(hfac), posstde une maille hexagonale et le complexe acttylacetone adopte la maille monoclinique de forme a des trois genres de structure cristalline typiques que Astbury (I) a observt pour les composts trispentane-2,4-dionatomttalliques. Les proprittts observkes pour le trispentane-2,4-dionatorht.nium(II1) diffirent de celles rapporttes prtctdemment (2, 3). Les difficultts rencontrtes pour obtenir le Re(C5H702), pur furent caustes par la facilitt avec laquelle le matCriel est oxydt.

New rhenium(III) complexes with fluorinated β-diketones

“…Three fluorine containing rhenium(III) com plexes with β diketones have been described to the present time: two heteroligand complexes ReСl 2 (CF 3 COCHCOCН 3 )(PPh 3 ) 2 and ReСl 2 (CF 3 COCHCOCF 3 )(PPh 3 ) 2 [2][3][4][5] and one monoligand complex Re(CF 3 COCHCOCF 3 ) 3 [6,7].…”