Electronic Supplementary Information (ESI) Area negative thermal expansion in mixed metal mixed organic MOF: “elevator-platform” mechanism induced by O–H···O hydrogen bonding Ashutosh Shrivastava, a Lalita Negi a and Dinabandhu Das* a a School of Physical Sciences. Jawaharlal Nehru University, New Delhi-110067, India. Email: jnu.dinu@gmail.com. Electronic Supplementary Material (ESI) for CrystEngComm. This journal is © The Royal Society of Chemistry 2018