N,7,7‐Tricyanoquinomethanimine (TCQMI) Based Organic Magnetic Materials |
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| Authors: | Jordan L Arthur Saul H Lapidus Curtis E Moore Arnold L Rheingold Peter W Stephens Joel S Miller |
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| Affiliation: | 1. Department of Chemistry, University of Utah, Salt Lake City, UT 84112‐0850, USA;2. Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794, USA;3. Department of Chemistry, University of California, San Diego, La Jolla, CA 92093‐0358, USA;4. Photon Sciences Directorate, Brookhaven National Laboratory, Upton, NY 11973, USA |
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| Abstract: | The synthesis and characterization of a new family of magnetic materials based on the electron accepting cyanocarbon N,7,7‐tricyanoquinomethanimine, TCQMI, its radical anion TCQMI], and its σ‐dimer, σ‐TCQMI]22?, are reported. FeIIICp*2]TCQMI] (where Cp* is pentamethylcyclopentadienide) forms parallel chains of alternating TCQMI]?? and FeCp*2]?+ and magnetically orders at 3.4 K as a weak ferromagnet. MTCQMI]2?zCH2Cl2 (M = V, Fe) are amorphous solids with TCQMI]?? coordinated to metal centers through the nitrile groups. The Fe compound magnetically orders as a weak ferromagnet at ≈4 K, whereas the V compound shows no evidence of magnetic ordering. {MnIIITPP]+}2TCQMI]22? (TPP = tetraphenylporphyrin) results from the reaction of TCQMI with MnIITPP(py) due to the formation of the TCQMI]22? σ‐dimer in situ, and is a weak ferromagnet below 3.7 K. The lack of magnetic ordering in VTCQMI]2?zCH2Cl2 is not currently understood, and is in strong contrast to VTCNE]2?zCH2Cl2, which magnetically orders above room temperature. |
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