Syntheses, Characterizations, and Interconversion Reactions of cisand trans -Bis(2,4-pentanedionato)diaquachromium(III) Complexes. Application to the Cleavage Reactions of the Chromium-Carbon Bonds in trans -(Dichloromethyl and chloromethyl)bis(2,4-pentanedionato)aquachromium(III) Complexes in Aqueous Solutions

0 ) 04]•2 20 (b), and Figure 2, showing powder diffractograms of H[SnCl(0H)As04]-2H20 (a) and H[SnCl(0H)P04]-2H20 (2 pages).Ordering information is given on any current masthead page.

The complexes, [Cr(CHCl2)(acac)2L] (L = H2O, CH3OH, and pyridine), were prepared, where acac− denotes 2,4-pentanedionate ion. [Cr(CHCl2)(acac)2(CH3OH)] reacts with pyridine(py) rapidly to give [Cr(CHCl2)(acac)2(py)]. The structure of [Cr(CHCl2)-(acac)2(py)] has been determined to be trans by single crystal X-ray diffraction. The Cr–N(py) bond lengthens to 2.16(1) Å. This may be associated with that rapid substitution reaction.