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The reaction of (NH 4 ) 2 [Ce(NO 3 ) 6  ] with two equivalents of OPPh 3 (Ph = C 6 H 5  ) in acetonitrile yields Ce(NO 3  )  4 (OPPh 3  ) 2  (1) in high yield, whereas using acetone as solvent affords mer- Ce(NO 3  ) 3 (OPPh 3 ) 3  • 2(CH 3 ) 2 CO (2), the yield of which is dependent on the reaction time. A crystal structure determination of 2 shows that the Ce atom is coordinated with three bidentate nitrato groups and three OPPh 3  ligands, thus achieving a coordination number of nine. Eight non-coordinating acetone molecules are present in the unit cell. Crystal data (292 K): space group P2 1 /n (no. 14), 0=12.438(2), b = 25.532(4), c = 20.379 (4) Å, β = 96.33(2)°, V = 6432(1) , Z = 4, d calc  = 1.318 g em 3. Due to poor crystal quality the refinement converges at R = 0.11, R w  = 0.09. 2 is paramagnetic, but it does not follow the Curie-Weiss law at low temperature. Therefore crystal field theory was used in order to explain these findings.

zeitschrift für naturforschung a

Reinvestigation of the Reaction of (NH 4 ) 2 [Ce(N0 3 ) 6 ] with Triphenylphosphine Oxide; the Crystal Structure and Magnetic Properties of mer-Ce(NO 3 ) 3 (OPPh 3 ) 3  • 2 (CH 3 ) 2 CO