Reduced and Excited States of (bpym)PtCl2n (bpym = 2,2'-Bipyrimidine; n = 1, 2): Experiments and DFT Calculations
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Inorganic Chemistry 41 (16): 4139--4148 (2002)

The complexes (bpym)PtCl2 (1) and the new (m-bpym)PtCl22 (2), bpym = 2,2'-bipyrimidine, were synthesized and, in the case of 1, crystd. in solvent-free form for x-ray diffraction. The mols. 1 exhibit two different kinds of stacking motifs in the crystal with an interstack CH--N interaction. Complexes 1 and 2 are sufficiently sol. for cyclic voltammetry, spectroscopy (absorption and emission), and spectroelectrochem. studies (UV-visible, EPR). As a result of single or double coordination of the strongly s-accepting PtCl2 fragment to bpym, the paramagnetic anions 1.bul.- and 2.bul.- and the dianions 12- and 22- could be reversibly generated, despite the presence of metal-halide bonds. DFT calcns. of A(195Pt) and g tensor components confirm that the singly occupied MOs of the monoanionic species have mainly p (bpym) character with nonnegligible Pt d orbital participation. The assignments of the electronic absorption and emission and resonance Raman spectra for both complexes are supported by DFT calcns. on SciFinder(R)
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