Reduction of the pincer complex [OsCl(PNP)] (PNP = N(CHCHPtBu)) affords the isolation and full characterization of an osmium(ii) complex with square-planar coordination geometry, i.e. [OsCl(PNP)]. Spectroscopic, structural and magnetic data in combination with multireference computations indicate strong temperature independent paramagnetism, which arises from an energetically well separated ground state that mixes with excited states through spin-orbit coupling.
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