- 作者: 魏和祥; 高世平
- 作者服務機構: Department of Chemistry, Tamkang University, Tamsui, Taiwan, R.O.C.
- 中文摘要: The spin transition of high-spin (/sup 5/T/sub 2/).harlor.low-spin (/sup 1/A/sub 1/) of (dithiocyanato) (N-phenyl-2-pyridinaldimine) iron (II) complexes can be altered by substituents on the phenyl ring. Mossbauer spectra at 78 K for the 4-substituted derivatives (with the exception of the 4-OH-substituted derivative) indicate that the fraction of low-spin states increases with decreasing substituent electron-withdrawing ability, as measured by the Hammet .sigma. constant (4-OCH/sub 3/<4-CH/sub 3/CONH 4-C/sub 6/H/sub 5/<4-CH/sub 3/<4-H<4-Cl<4-NO/sub 2/). In addition, the effect of methyl-substitution at the ortho-, meta- or paraposition of the phenyl ring on the apin transition was examined. Mossbauer spectra of these methyl-substituted complexes reveal quite different spin equilibria.
- 英文摘要: --
- 中文關鍵字: Mossbauer effect; iron-complexes.
- 英文關鍵字: Mossbauer effect; iron-complexes.