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@article{Gutzeit.2019,
 abstract = {Axial coordination in nickel(II) porphyrins has been thoroughly investigated and is well understood. However, isolated five-coordinate nickel(II) porphyrins are still elusive after 50 years of intense research, even though they play a crucial role as intermediates in enzymes and catalysts. Herein we present the first fully stable, thoroughly characterized five-coordinate nickel(II) porphyrin in solution and in the solid state (crystal structure). The spectroscopic properties indicate pure high-spin behavior ( S = 1). There are distinct differences in the NMR, UV-vis, and redox behavior compared to those of high-spin six-coordinate [with two axial ligands, such as NiTPPF10·(py)2] and low-spin four-coordinate (NiTPPF10) nickel(II) porphyrins. The title compound, a strapped nickel(II) porphyrin, allows a direct comparison of four-, five-, and six-coordinate nickel(II) porphyrins, depending on the environment. With this reference in hand, previous results were reevaluated, for example, the switching efficiencies and thermodynamic data of nickel(II) porphyrin-based spin switches in solution.},
 author = {Gutzeit, Florian and Dommaschk, Marcel and Levin, Natalia and Buchholz, Axel and Schaub, Eike and Plass, Winfried and N{\"a}ther, Christian and Herges, Rainer},
 year = {2019},
 title = {Structure and Properties of a Five-Coordinate Nickel(II) Porphyrin},
 journal = {Inorg. Chem.}
}