SYNTHESIS, MOLECULAR-STRUCTURE, AND REACTIONS OF BIS(TETRAPHENYLPHOSPHONIUM) HEXAKIS(MU-THIOPHENOLATO)-TETRACHLOROTETRAFERRATE(II), (PH4P)2[FE4(SPH)6CL4] - ITS REACTIONS WITH DIBENZYL TRISULFIDE AND THE SYNTHESIS OF THE [FE4S4CL4]2- AND [FE4S4(CL)2(SC6H5)2]2- CUBANE-TYPE CLUSTERS