SYNTHESIS AND SOLID-STATE STRUCTURE OF [K-3(THF)(2)(PH(MES))(3)](INFINITY) (MES = 2,4,6-ME3C6H2) - THE FIRST POTASSIUM PHOSPHANIDE WITH A POLYHEDRAL ARRANGEMENT OF K-ATOMS AND P-ATOMS

KPH(Mes) (Mes = 2,4,6-Me3C6H2), prepared from potassium and PH(2()Mes) in refluxing toluene, crystallises from thf-pentane as [K-3(thf)(2){P H(Mes)}(3)](infinity) 1, in which the basic structural feature is a ch ain of tetragonal pyramids of KP5 units, which share common edges, and two additional K atoms located over two adjacent edges of one trigona l face of the pyramid.