1. Indian Institute of Technology Guwahati, Department of Chemistry, Guwahati, 781039 Assam, India, http://www.iitg.ernet.in/sbiswas/
2. State Key Laboratory of Fine Chemicals, Dalian University of Technology, 116024, Dalian, China
3. Current address: Clariant Produkte (Deutschland) GmbH, Waldheimer Strasse 13, 83052 Bruckmuehl, Germany
4. Institute for Chemical Technologies and Analytics, Division of Structural Chemistry, Vienna University of Technology, Getreidemarkt 9/164‐SC, 1060 Vienna, Austria
5. Institute of Physics, Chair of Solid State Science, Augsburg University, Universitätsstrasse 1, 86135 Augsburg, Germany