The molecular spin state of NiII porphyrin, supported on a ferromagnetic Co surface, can be reversibly switched between spin‐off (S=0) and spin‐on (S=1) states upon coordination and decoordination of the gaseous ligand NH3, respectively (see picture). This finding clearly indicates the possible use of the system as a single‐molecule‐based magnetochemical sensor and in spintronics.

Abstract

Count against: Stable and planar antiaromatic, expanded vinylogous isophlorins encourage chalcogen–fluorine noncovalent interactions. The wide cavity of the macrocycle accommodates covalently bound fluorine substituents, thus leading to multiple nonbonding interactions