Conclusions.

In IrH(PMe₃)₃(SH)⁺ the observed geometry is clearly due to an interaction with the counter-ion.

In IrH(PMe₃)₃(OH)⁺ several factors are playing important roles: electrostatic forces between the counter-ion and the H-Ir, and between Ir-H and H-O are observed. A small but positive overlap population between the two H's can also mean a bonding covalent interaction between the two atoms. All these interations are likelly to be important because the distortion of the H-O-Ir angle from the tetrahedral values occur with little cost in energy, as can be seen in Figure 2.

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