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W. Zeni, M. Seifried, C. Knoll, Jan Welch, G. Giester, B. Stöger, W. Artner, M. Reissner, D. Müller, P. Weinberger:
"Bifunctional Fe(II) Spin Crossover-complexes based on ω-(1H-tetrazol-1-yl) carboxylic acids";
Dalton Transactions, 49 (2020), 17183 - 17193.

To increase the supramolecular cooperativity in Fe(II) spin crossover materials based on N1-substitutedtetrazoles, a series of ω-(1H-tetrazol-1-yl) carboxylic acids with chain-lengths of C₂-C₄ were synthesized.Structural characterization confirmed the formation of a strong hydrogen-bond network, responsible for enhanced cooperativity in the materials and thus largely complete spin-state transitions for the ligandswith chain lenghts of C₂ and C₄. To complement the structural and magnetic investigation, electronic spectroscopy was used to investigate the spin-state transition. An initial attempt to utilize the bifunctional coordination ability of the ω-(1H-tetrazol-1-yl) carboxylic acids for preparation of mixed-metallic 3d-4f coordination polymers resulted in a novel one-dimensional gadolinium-oxo chain system with the ω-(1H-tetrazol-1-yl) carboxylic acid acting as μ₂-η²:η¹ chelating-bridging ligand.

http://dx.doi.org/10.1039/d0dt03315d

https://publik.tuwien.ac.at/files/publik_292402.pdf