Tunable luminescenZce of cyclometallated platinum(II) derivatives based on novel pyrimidine-contained tridentate Pt(NCN)Cl complexes

Two novel tridentate Pt(N boolean AND C boolean AND N)Cl complexes, la and 2a, with an electron-deficient pyrimidine-contained N boolean AND C boolean AND N tridentate ligand, were synthesized and characterized. Single crystal X-ray diffraction of la revealed a cyclometallated square-planar geometry. In the single crystal, la adopted a head-to-head dimeric form with the shortest Pt center dot center dot center dot Pt distance of 4.22 angstrom and pi-pi stacking affording one-dimensional nanostructure along a-axial direction. Interestingly, in contrast to la, Pt center dot center dot center dot Pt interaction of 2a, with a flexible alkyl chain substituent, could be induced by facile solution processable self-assembly, allowing for modulation of luminescence from visible to near-IR (NIR) region. (C) 2017 Elsevier Ltd. All rights reserved.