Vapochromism and Magnetochemical Switching of a Nickel(II) Paddlewheel Complex by Reversible NH3 Uptake and Release

Katharina M. Fürpaß, Lydia M. Peschel, Jörg A. Schachner, Sergey M. Borisov, Heinz Krenn, Ferdinand Belaj, Nadia C. Mösch-Zanetti*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Reaction of [NiCl2(PnH)4] (1) (PnH=6-tert-butyl-pyridazine-3-thione) with NiCl2 affords the binuclear paddlewheel (PW) complex [Ni2(Pn)4] (2). Diamagnetic complex 2 is the first example of a PW complex capable of reversibly binding and releasing NH3. The NH3 ligand in [Ni2(Pn)4(NH3)] (2⋅NH3) enforces major spectroscopic and magnetic susceptibility changes, thus displaying vapochromic properties (λmax(2)=532 nm, λmax(2⋅NH3)=518 nm) and magnetochemical switching (2: S=0; 2⋅NH3: S=1). Upon repeated adsorption/desorption cycles of NH3 the PW core remains intact. Compound 2 can be embedded into thin polyurethane films (2P) under retention of its sensing abilities. Therefore, 2 qualifies as reversible optical probe for ammonia. The magnetochemical switching of 2 and 2⋅NH3 was studied in detail by SQUID measurements showing that in 2⋅NH3, solely the Ni atom coordinated the NH3 molecule is responsible for the paramagnetic behavior.

Original languageEnglish
Pages (from-to)13401-13404
Number of pages4
JournalAngewandte Chemie - International Edition
Volume60
Issue number24
DOIs
Publication statusPublished - 7 Jun 2021

Keywords

  • ammonia
  • nickel complexes
  • paddlewheel complexes
  • spin-state switching
  • vapochromism

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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