Synthetic Metals, 29 (1989) F65-F70 F65
THE LITHIUM PHTHALOCYANINE RADICAL: A LOW-DIMENSIONAL MOLECULAR BAND
SEMICONDUCTOR
Ph. TUREK, M. MOUSSAVI, P. PETIT and d.-J. ANDRE
Institut Charles Sadron, 67083 Strabourg C~dex (France)
ABSTRACT
The lithium phthalocyanine neutral ~-radical molecular compound is depicted
as a low-dimensional intrinsic band semiconductor whose spins are submitted to
strong exchange interactions.lt is suggested that the charge/spin carriers of
this system ought to be analyzed in the frame of itinerant magnetism.
INTRODUCTION
The lithium phthalocyanine neutral n-radical compound, PcLi, has been shown
to exhibit somewhat peculiar features such as e.g. intrinsic semiconducting
behaviour [1,2] or extreme spin exchange narrowing [3]. The present contribution
reports on further conductivity measurements either DC or microwave, performed
on different samples.These results definitely assess the intrinsic character of
the electrical conductivity in the semiconducting range.Some EPR experiments are
reported which emphasize as well the low-dimensionality as the itinerant charac-
ter, i.e. band related, of the n-spin system.
RESULTSAND DISCUSSION
Direct current and microwave conductivity
The samples were grown either in acetone or in acetonitrile
described [4]. They consist in crystalline materials whose
as previously
structure corres-
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