Zhang X.,Hainan Normal University |
Zhang X.,Key Laboratory of Water Pollution Treatment and Resource Reuse of Hainan Province |
Zhang X.,Nanjing University |
Zhu L.,Hainan Normal University |
And 7 more authors.
Inorganica Chimica Acta | Year: 2016
A couple of enantiomeric chiral cyclometalated platinum(II) complexes [Pt(-)-L1]Cl ((-)-1) and [Pt(+)-L1]Cl ((+)-1) [(-)-L1 = (-)-4,5-pinene-6′-phenyl-2,2′-bipyridine, (+)-L1 = (+)-4,5-pinene-6′-phenyl-2,2′-bipyridine] were obtained, studying their mechanochromic behaviors, and corresponding luminescent, chiroptical and nonlinear optical properties. Upon mechanical grinding, the crystallites of (-)-1 and (+)-1 undergo a crystal-to-amorphous and ordered-to-disorder transformation. For these grinding-induced amorphous and poorly organized aggregates, the luminescence was distinctly red-shifted (Δλem = 160 nm) compared to that of crystallites. Moreover, electronic circular dichroism signals and nonlinear optical responses became almost silent. Remarkably, the poorly organized amorphous phase can be easily restored to original crystalline state upon treatment with a few drops of dichloromethane, suggesting an excellent reversible switch. © 2015 Elsevier B.V. All rights reserved.