Supporting Information for: Role of basic sites of substituted ferrocenes in interaction with the trinuclear 3,5- bis(trifluoromethyl)pyrazolates: thermodynamics and structure of complexes Alexey A. Titov † , Oleg A. Filippov † , Ekaterina A. Guseva † , Alexander F. Smol’yakov † , Fedor M. Dolgushin † , Lina M. Epstein † , Vitaly K. Belsky ‡ , Elena S. Shubina † * † A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov str. 28, 119991 Moscow, Russia ‡ L.Ya. Karpov Institute of Physical Chemistry, Vorontsovo Pole St. 10, 103064, Moscow, Russia IR spectroscopy cm -1 1600 1620 1640 1660 1680 1700 A 0.0 0.1 0.2 0.3 0.4 0.5 0.6 ν(CO) init ν(CO) bond Electronic Supplementary Material (ESI) for RSC Advances This journal is © The Royal Society of Chemistry 2014