The reactions of blue luminescent ligands 1,3-bis(7-azaindolyl)benzene (BabH), 1-bromo-3,5-bis(7-azaindolyl)benzene (Br−BabH), and 1,3,5-tris(7-azaindolyl)benzene (TabH) with K 2 PdCl 4 and K 2 PtCl 4 have been investigated. Five new luminescent cyclometalated palladium(II) and platinum(II) complexes Pd(Bab)Cl ( 1 ), Pt(Bab)Cl ( 2 ), Pd(Br−Bab)Cl ( 3 ), Pt(Br−Bab)Cl ( 4 ), and Pd 3 Cl 4 (Tab) 2 ( 5 ) have been synthesized and fully characterized. The molecular structures of 1 and 2, and 3 and 4, are similar. There are however significant variations in the solid-state structures and luminescence of 1 and 2, and 3 and 4 . EHMO calculations revealed that it is most likely that the electronic transitions in the Pt(II) complexes are π to π* transitions with significant contributions from d π lone pairs of the Pt(II) center in the π level, and the electronic transitions in the Pd(II) complexes are either d( z 2 ) to π* charge-transfer transitions or π to π* transitions similar to the Pt(II) complexes.
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Song et al. (2001) studied this question.