Cyclometalated platinum(II) complexes with sterically bulky camphor-derived groups as β-diketonate ancillary ligand: a new route to efficiently reducing π-π interactions and Pt-Pt interactions

• Published in: Science China Chemistry Vol. 53; no. 1; pp. 167 - 172
• Main Authors: Luo, KaiJun, Xie, Yu, Xu, LingLing, Wang, JiangWei, Zhang, LiFang, Zhao, KeQing
• Format: Journal Article
• Language: English
• Published: Heidelberg SP Science in China Press 2010; Springer Nature B.V
• Subjects: Aromatic compounds; Camphor; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Crystal structure; Emission spectra; Ligands; Organic light emitting diodes; Phosphorescence; Platinum; Single crystals; crystal structure; sterically bulky camphor derivatives; π-π interactions; cyclometalated Pt(II) complexes
• ISSN: 1674-7291; 1862-2771; 1869-1870
• DOI: 10.1007/s11426-010-0018-y

A new series of mono-cyclometalated square planar platinum(II) complexes have been synthesized and the single-crystal X-ray structures of complex 1 and 2 have been determined. The complexes have the general formula ppy Pt( O ∧ O ), where ppy is 2-phenylpyridyl, and O ∧ O is β-diketonate ancillary ligands with the acyl substituent group in position 3 of (D)-(+)-camphor. Although, like the many Pt(II) complexes with square-planar geometry, these complexes have plane stacking modes in crystal structure, the sterically bulky camphor-derived groups compel extensive slipping of the molecular stacking planes, resulting in the negligible overlapping of the aromatic ring fragments between molecules and the considerable Pt-Pt distance. The resolved spectra and a little shifted emission in solid state of complexes show that there is significant reduction of π-π interactions and Pt-Pt interactions, and suggest these complexes may be good candidates for doped phosphorescent organic light emitting diodes (PhOLEDs) and even for nondoped PhOLEDs.