Iridium pincer complexes (e.g. (PCP)IrHn; PCP = 2,6-C
6H
3(PR
2)
2) are the most effective molecular catalysts known for the dehydrogenation of alkanes. In an effort to screen other pincer ligated transition metal complexes as potential catalysts, we have begun an investigation of the isoelectronic group 8 PNP series (PNP = 2,6-bis(dialkylphosphinomethyl)pyridine). Toward this end, two new catalyst precursors of the type (
tBuPNP)MCln (M = Fe, n = 2; M = Os, n = 3) have been synthesized. Reduction of (
tBuPNP)OsCl
3 with NaEt
3BH
4 yields the tetrahydride complex, (
tBuPNP)OsH
4; this is a purely classical (Os(IV)) tetrahydride, in contrast with iridium analogues (PCP)IrH
4, which show short H-H distances. (
tBuPNP)Fe(CO)
2, an unusually blue colored complex, has been synthesized by reaction of (
tBuPNP)FeCl
2 with either NEt
4BH
4 or Na(Hg) under CO. This complex has unusual bent Fe-C-O angles. The characterization of the new complexes will be discussed, including their electronic structures. DFT calculations will be presented which, in particular offer insight into the bent Fe-C-O angles of (
tBuPNP)Fe(CO)
2.
