Syntheses and Structures of New Luminescent Cyclometalated Palladium(II) and Platinum(II) Complexes: M(Bab)Cl, M(Br−Bab)Cl (M = Pd(II), Pt(II)), and Pd<sub>3</sub>Cl<sub>4</sub>(Tab)<sub>2</sub> (Bab = 1,3-bis(7-azaindolyl)phenyl, Br−Bab = 1-Bromo-3,5-bis(7-azaindolyl)phenyl, Tab =1,3,5-tris(7-azaindolyl)phenyl)
作者:Datong Song、Qingguo Wu、Andrea Hook、Igor Kozin、Suning Wang
DOI:10.1021/om010235z
日期:2001.10.1
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 K2PdCl4 and K2PtCl4 have been investigated. Five new luminescent cyclometalated palladium(II) and platinum(II) complexes Pd(Bab)CI (1), Pt(Bab)CI (2), Pd(Br-Bab)CI (3), Pt(Br-Bab)CI (4), and Pd3Cl4(Tab)(2) (5) have been synthesized and fully characterized. The molecular structures of I 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 pi to pi* transitions with significant contributions from d(pi) lone pairs of the Pt(II) center in the pi level, and the electronic transitions in the Pd(II) complexes are either d(z(2)) to pi* charge-transfer transitions or pi to pi* transitions similar to the Pt(II) complexes.