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The construction of hierarchical nanostructures plays an important role in performance improvement and application expansion of advanced nanomaterials. The fabrication of three dimensional hierarchical graphene nanostructures (TGNs) with controlled primary building units and secondary structures is still a challenge in synthetic methodology, since it is difficult to achieve the necessary delicate arrangement of graphene. TGNs with controlled primary building units and secondary structures are realized here via a metal complex strategy. Ni-Based metal complexes with organic polybasic acid ligands are used as the precursors of the TGNs. The results show that the amount of Ni(CH3COO)2·4H2O determines the different morphologies and compositions of the metal complex precursors, which further determine the primary building units and secondary structures of the TGNs. The obtained TGNs can serve as excellent candidates for anode materials for lithium ion batteries to achieve superior electrochemical behaviors. [ABSTRACT FROM AUTHOR]

By using aryl-thiazoles as cyclometalated ligands and an oxadiazol-substituted amide as the ancillary ligand, three novel iridium(iii) complexes have been synthesized and characterized, and their photophysical and electrochemical properties have been investigated. Complexes 1–3 exhibit efficient phosphorescence emissions at 542, 555 and 585 nm with photoluminescence quantum yields (PLQYs) of 0.04, 0.03 and 0.02 in CH3CN solutions, respectively. In the 10 wt% doped 2,4-diphenyl-6-bis(12-phenylindolo)[2,3-a]carbazole-11-yl)-1,3,5-triazine (Dictrz) film, the PLQYs (0.88 for complex 1, 0.47 for complex 2 and 0.37 for complex 3) increase significantly owing to the great restriction of rotations and vibrations in the rigid host. The organic light-emitting diodes based on these complexes show good performance with maximum current efficiencies of 20.06, 22.20 and 13.45 cd A−1 and maximum power efficiencies of 13.54, 17.31 and 9.48 lm W−1 with CIE coordinates of (0.46, 0.53), (0.49, 0.50) and (0.59, 0.40) for complexes 1–3, respectively. [ABSTRACT FROM AUTHOR]