Examples of VAP schemes include the extended Hartree-Fock (HF) method of Löwdin and, more recently, the projected Hatree-Fock (PHF) method developed recently by Scuseria and co-workers. PAV and VAP results are not directly comparable and the formal weaknesses of PAV are well documented. However, in the case of HF theory (particularly when small basis sets are employed) PAV appears to provide a clean separation of correlation types, which may present a pathway for ongoing theory and methods developments. However, in the case of DFT approaches, such a claim is somewhat more tenuous due to the more complicated nature of the S 2 operator and inclusion of some degree of static correlation in many commonly used density functionals; although, many popular functionals exhibit similar numerical behavior to HF in molecular systems experiencing spin contamination from symmetry breaking. Approximate Projection (AP), a PAV method proposed by Yamaguchi and coworkers, and other related spin-decontamination models by Malrieu and coworkers have been successfully used in energy calculations of transition metal complexes and organic diradicals. In a particularly intriguing report, Malrieu and Trinquier studied the effect of spin contamination on broken-symmetry singlet states of organic diradicals using a method they developed that estimates the optimized geometry of a spin projected singlet using AP like models. However, to the best of our knowledge, there has not yet been a systematic investigation of the impact of AP or related projection models on the geometries and subsequent property calculations of transition metal systems. To address this question, we have applied AP to two classes of problems: (1) calculation of exchange coupling constants (J-couplings) for a set of binuclear transition metal complexes; and (2) spin crossover gaps for mononuclear transition metal complexes.