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Magnetic behavior of polycarbosilazane Fe II , Fe III and mixed‐valence Fe II–III chloride metallopolymers
Author(s) -
Ali Hamam Yaqoub,
El Ghanem Hasan Moh'd,
Mahmoud Arafa Issam,
Said Moh'd Rida,
aljarayish Ibrahim Abo
Publication year - 2007
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.2157
Subject(s) - valence (chemistry) , macromolecule , chemistry , chloride , divalent , amine gas treating , crystallography , atmospheric temperature range , metal , inorganic chemistry , magnetization , chain (unit) , polymer chemistry , organic chemistry , magnetic field , physics , thermodynamics , biochemistry , quantum mechanics , astronomy
Fe II , Fe III and mixed‐valence Fe II–III chlorides were reacted with poly[ N , N ′‐bis(dimethylsilyl)ethylenedi‐ amine], [Si(CH 3 ) 2 NHCH 2 CH 2 NH] n , to form the corresponding Fe‐polycarbosilazane macromolecular complexes. The average chain–chain spacing in these materials was estimated from X‐ray diffraction data and found to be 6.94, 7.29, 7.30 and 7.45 Å in metal‐free and Fe II , Fe III and Fe II–III ‐containing polycarbosilazanes, respectively. This demonstrates that Fe II , Fe III and Fe II–III chlorides are encapsulated between the polycarbosilazane chains. The chain–chain expansions in the divalent Fe II and trivalent Fe III chloride macromolecular complexes are comparable, but less than that in the Fe II–III chloride analog, which suggests that different chain–chain packings exist in the mixed‐valence macromolecular complex. The magnetic properties of the resulting complexes were investigated by measuring the magnetization in magnetic fields up to 8 kOe and in the temperature range from liquid nitrogen temperature to room temperature. Copyright © 2007 Society of Chemical Industry