Cu(pc)I: a molecular metal with a one-dimensional array of local moments embedded in a Fermi Sea of charge carriers
Treatment of (phthalocyaninato)copper(II), Cu(pc), with elemental iodine affords (phthalocyaninato)copper iodide, Cu(pc)I. This material is comprised of metal-over-metal stacks of partially oxidized Cu(pc) groups surrounded by linear chains of I/sub 3//sup -/ ions. Reflectivity spectra from single crystals of Cu(pc)I exhibit a very sharp plasma edge for light polarized parallel to the stacking direction and four-probe conductivity measurements show a room temperature conductivity of ca. 10/sup 3/ Omega/sup -1/ cm/sup -1/ along this direction. Together these measurements indicate that Cu(pc)I is the most highly conductive porphyrinic molecular metal studied to date and is among the most conductive molecular crystals known. Crystal data: tetragonal, space group D/sub 4h//sup 2/-P4/mcc with a = 13.888 (12) A, c = 6.390 (8) A, V = 1232 A/sup 3/, and Z = 2. Thermoelectric power and magnetic susceptibility measurements show that the charge carriers of Cu(pc)I are holes in the 5/6 filled band comprised of overlapping p-..pi.. orbitals from adjacent pc rings. The metal sites in this material retain their paramagnetic Cu/sup 2 +/ oxidation state, and thus Cu(pc)I represents the first example of a one-dimensional array of local moments embedded in a Fermi sea of charge carriers.
- Research Organization:
- Northwestern Univ., Evanston, IL
- OSTI ID:
- 6813122
- Journal Information:
- J. Am. Chem. Soc.; (United States), Vol. 109:4
- Country of Publication:
- United States
- Language:
- English
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400201* - Chemical & Physicochemical Properties