TY - JOUR
T1 - High spin/low spin phase transitions of a spin-crossover complex in the emulsion polymerization of trifluoroethylmethacrylate (TFEMA) using PVA as a protective colloid
AU - Suzuki, Atsushi
AU - Fujiwara, Motoyasu
AU - Nishijima, Masahiko
N1 - Funding Information:
We acknowledge Associate Prof. T. Suzuki, Mr. Yamanaka and Mr. Nagata for assistance with optical techniques through the financial support of an operating grant from the Institute of Molecular Science (IMS) in Japan. We also thank Mr. E. Miyagawa, Mr. Higashiyama for ultimate and DSC analysis, and Mr. Abe for AFM measurements at Northeastern Industrial Research Center of Shiga Prefecture.
PY - 2008/5
Y1 - 2008/5
N2 - We have studied the magnetic properties of an Fe(II) spin-crossover complex near its high spin/low spin (HS/LS) phase transition in the emulsion polymerization of trifluoroethylmethacrylate (TFEMA) using poly(vinyl alcohol) (PVA) as a protective colloid, in comparison with sodium lauryl sulfate (SLS). Morphological analysis was used to establish that the nanodispersed spin-crossover complex was incorporated into the cores of polymer particles covered with PVA shells. The obvious bi-stability of the HS/LS phase transition was considered by the identification of multiplet states such as the triplet (S = 1) and quintet (S = 2) states, and the paramagnetic state (S = 1/2), by noting a gradual shift of g-value anisotropy in the electron spin resonance (ESR) spectrum at 5 K. This was thought to have arisen from the exchange interaction as a Jahn-Teller effect in the emulsion particles. Chemical modifications such as ligand substitution, and the nature of the central metal atom in the emulsion particle, especially influenced the HS/LS phase transition.
AB - We have studied the magnetic properties of an Fe(II) spin-crossover complex near its high spin/low spin (HS/LS) phase transition in the emulsion polymerization of trifluoroethylmethacrylate (TFEMA) using poly(vinyl alcohol) (PVA) as a protective colloid, in comparison with sodium lauryl sulfate (SLS). Morphological analysis was used to establish that the nanodispersed spin-crossover complex was incorporated into the cores of polymer particles covered with PVA shells. The obvious bi-stability of the HS/LS phase transition was considered by the identification of multiplet states such as the triplet (S = 1) and quintet (S = 2) states, and the paramagnetic state (S = 1/2), by noting a gradual shift of g-value anisotropy in the electron spin resonance (ESR) spectrum at 5 K. This was thought to have arisen from the exchange interaction as a Jahn-Teller effect in the emulsion particles. Chemical modifications such as ligand substitution, and the nature of the central metal atom in the emulsion particle, especially influenced the HS/LS phase transition.
KW - Emulsion polymerization
KW - Highspin/low spin (HS/LS) phase transition
KW - Poly(vinylalcohol) (PVA)
KW - Spin-crossover complex
KW - Trifluoroethyl methacrylate(TFEMA)
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U2 - 10.1007/s00396-007-1796-4
DO - 10.1007/s00396-007-1796-4
M3 - Article
AN - SCOPUS:42549138489
VL - 286
SP - 525
EP - 534
JO - Colloid and Polymer Science
JF - Colloid and Polymer Science
SN - 0303-402X
IS - 5
ER -