Metal complexes in an octahedral coordination environment with an electronic configuration of d4-7 can either exist in the high spin (HS) or low spin (LS) forms. To drive the spin transition in spin crossover (SCO) compounds rigid ligands evoking a strong ligand field are considered to be necessary to stabilize the LS state.[1] In the course of our research on click-derived 1,2,3-triazole ligands[2] we got interested in the tripodal ligand TBTA. The reaction of TBTA with common Co(II) and Fe(II) precursors yielded a variety of complexes. Interestingly, the homoleptic complexes showed a pronounced intramolecular CH-p T-stacking motif. Thorough investigation revealed the unique role of this weak interaction in SCO behaviour of the Co(II) and Fe(II) complexes and the possibilities to make use of its deliberate perturbation.[3] Figure 1. <img src='https://acs-archive-assets2.s3.amazonaws.com/239nm/uploads/13899_acs.jpg' alt='' />[1] P. G�tlich et al., Chem. Soc. Rev. 2000 , 29, 419.[2] D. Schweinfurth et al., Dalton Trans. 2009 , 9291.[3] D. Schweinfurth et al., Inorg. Chem. 2011 , 50, 6114.

New insights into spin crossover behaviour: The crucial role of π-π stacking

243rd National Meeting (2012)

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