Servant Leadership and Service Performance: A Multilevel Mediation Model.

This study proposes and tests a multilevel mediation framework to explicate the processes that link servant leadership to frontline employees' service performance at both the employee and the branch levels of analysis. Data were obtained from 58 branch managers and 324 branch frontline employees of a chain restaurant in Taiwan. The results of hierarchical linear modelling indicate that two factors, concern climate and work engagement, mediate the relationship between branch managers' servant leadership and frontline employees' service performance; and that work engagement mediates the relationship between concern climate and such service performance.

Cationic iridium complexes with intramolecular π-π interaction and enhanced steric hindrance for solid-state light-emitting electrochemical cells.

Cationic iridium complexes incorporated 4,5-diaza-9,9'-spirobifluorene as N(∧)N ancillary ligands, in which one (2) or two (3) phenyl groups were introduced onto 4,5-diazafluorene to afford intraligand π-π interactions. The X-ray crystal structures of complexes 2 and 3 show that the pendant phenyl ring forms strong intramolecular face-to-face π-stacking with the difluorophenyl ring of the cyclometalated ligand with distances of 3.38 Å for complex 2 and 3.