Judith L. Stanton

Porphyrinic Molecular Metals

Porphyrinic molecular metals rival the organic metals in the range of their properties and surpass them in the tunability of these properties. Such Such tunability is illustrated here by the change...

Magnetic transitions in a molecular metal with embedded local moments: Cu(pc)I

Abstract We discuss the low temperature magnetic properties of (phthalocyaninato)-copper(II) iodide (Cu(pc)I). This molecular metal contains conductive stacks that incorporate a one-dimensional array of local Cu +2 moments strongly coupled to conduction electrons. Below 20K, the EPR g-value of the coupled spin system increases anomalously and at 8K the EPR signal broadens abruptly and becomes unobservable. Anomalies in the proton NMR spin-lattice relaxation times are observed at the transition temperature. Preliminary EPR experiments conducted on a newly synthesized series of materials, Cu x Ni 1−x (pc)I, indicate the existence of a similar low temperature transition in the presence of various concentrations of loca moments.

Metallic Conductivity and Magnetic Interactions in Nickel and Copper Phthalocyanine Iodides

Abstract We discuss the charge transport and magnetic properties of the titled molecular metals. Replacement of the diamagnetic Ni(+2) by paramagnetic Cu(+2) introduces a novel coupling between local Cu(+2) spins the mobile charge carriers, and produces a coupled transition at 8 K.