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Syntheses and Electrical Conductivities of 9‐Fluorenone‐Iodine‐Alkali Iodide Complexes
Author(s) -
Yang HsinSheng,
Wang ChiMing
Publication year - 1987
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.198700046
Subject(s) - chemistry , alkali metal , iodide , fluorenone , raman spectroscopy , conductivity , iodine , metal , inorganic chemistry , yield (engineering) , electrical resistivity and conductivity , infrared , analytical chemistry (journal) , organic chemistry , polymer , physics , materials science , electrical engineering , fluorene , optics , metallurgy , engineering
A new series of 9‐fluorenone‐iodine‐alkali iodide complexes (FIMI, M=Na, K, Rb or Cs) has been prepared from chloroform. These complexes yield needle‐like crystals with metallic luster along the needle axis. The longitudinal dc conductivities at room temperature are in the order of 10 −3 to 10 −5 S cm −1 . They all have semiconductive properties with activation energies of about 0.4 to 0.7 eV . A significant result is that the conductivity varies systematically with the cation size. A decrease in the cation size results in an increase in the conductivity. Resonance Raman spectra show that iodine is present as a linear chain of symmetric I − 3 units in these complexes. Infrared spectra of these complexes are discussed with an attempt to estimate the interaction between the alkali cation and the carbonyl group of 9‐fluorenone.