I am trying to get basic information on the following compounds: osmium (I. II. III) iodide and osmium (III. IV) bromide. Beyond the fact that all five compounds exist, I have been able to find little.

I would like standard enthalpies of formation, vapor pressures, melting, boiling, or decomposition temperatures, and conditions of formation. I know that at least one of the iodides and one of the bromides can exist as a gas under some conditions, but I don’t know what those conditions are.

Any references or other help would be appreciated.