Mesomorphism and Luminescence Properties of Platinum(II) Complexes with Tris(alkoxy)phenyl‐Functionalized Pyridyl Pyrazolate Chelates

烷氧基 磷光 发光 铂金 结晶学 烷基 化学 分子间力 立体化学 材料科学 分子 有机化学 催化作用 光学 物理 荧光 光电子学
作者
Ching‐Ting Liao,Hsiu‐Hui Chen,Hsiu‐Fu Hsu,Anurach Poloek,Hsiu‐Hsuan Yeh,Yün Chi,Kang‐Wei Wang,Chin‐Hung Lai,Gene‐Hsiang Lee,Chun‐Wei Shih,Pi‐Tai Chou
出处
期刊:Chemistry: A European Journal [Wiley]
卷期号:17 (2): 546-556 被引量:74
标识
DOI:10.1002/chem.201000994
摘要

Abstract A series of new mesomorphic platinum(II) complexes 1 – 4 bearing pyridyl pyrazolate chelates are reported herein. In this approach, pyridyl azolate ligands have been strategically functionalized with tris(alkoxy)phenyl groups with various alkyl chain lengths. As a result, they are ascribed to a class of luminescent metallomesogens that possess distinctive morphological properties, such as their intermolecular packing arrangement and their associated photophysical behavior. In CH 2 Cl 2 , independent of the applied concentration in the range 10 −6 –10 −3 M , all Pt II complexes exhibit bright phosphorescence centered at around 520 nm, which is characteristic for monomeric Pt II complexes. In stark contrast, the single‐crystal X‐ray structure determination of [Pt(C4pz) 2 ] ( 1 ) shows the formation of a dimeric aggregate with a notable Pt⋅⋅⋅Pt contact of 3.258 Å. Upon heating, all Pt II complexes 1 – 4 melted to form columnar suprastructures, for which similar intracolumnar Pt⋅⋅⋅Pt distances of approx. 3.4–3.5 Å are observed within an exceptionally wide temperature range (>250 °C), according to the powder XRD data. Upon casting into a neat thin film at RT, the luminescence of 1 – 4 is dominated by a red emission that spans 630–660 nm, which originates from the one‐dimensional, chainlike structure with Pt–Pt interaction in the ground state. Taking complex 4 as a representative, the emission intensity and wavelength were significantly decreased and blueshifted, respectively, on heating from RT to 250 °C. Further heating to liquefy the sample alters the red emission back to the green phosphorescence of the monomer. The results highlight the pivotal role of tris(alkoxy)phenyl groups in the structural versus luminescence behavior of these Pt II complexes.
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