| 摘 要： | The undecaphosphide anion in ethylenediamine/18-crown-6 solution is isolated as K(18-crown-6)]3P11·2en 1.The crystal structure has been determined by single-crystal X-ray diffraction.The crystal is of monoclinic,space group P21 with a = 13.4731(7),b = 16.1123(6),c =16.5117(9) (A),β = 112.133(2)°,V = 3320.3(3) (A)3,Dc= 1.371 g/cm3,C40H88K3N4O18P11,Mr=1371.11,F(000) = 1444,μ = 0.532 mm-1,Z = 2,R = 0.0544 and wR = 0.1326 for 11423 observed reflections (I ＞ 2σ(I)).The "naked" P11 3- ion is stabilized by two partly sequestered potassiums.The third partly sequestered potassium does not interact with the P atom (P(6)) but with two solvent molecules.
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