2065 Table I
% H2 in H2-HD Acid :Cu
mixture13*
Mol of gas/ euuiv of Cu
Active H-/Culab
1.45:l 1.26:l 1.35:l
45.6 32.9 44.3
0.718 0.788 0.729
1.045 1.047 1.052
of 1.05 f 0.05 indicates a molecular stoichiometry of H~CUG(PP~S)B.~~ Although the hydride ligands were not detected directly from the X-ray diffraction study, the following observations can be made. (i) The arrangement of phosphine ligands precludes the possibility of terminal hydride ligands; slight variations of phosphine ligands Cutrans) = from truly apical positions [
