Switching behavior induced by different substituents of group in single molecular device Baoan Bian, Jingjuan Yang, Xiaoxiao Han, Haifeng Shi and Yuqiang Ding Eur. Phys. J. B, 91 8 (2018) 184 Published online: 03 August 2018 DOI: 10.1140/epjb/e2018-90269-3