Intraligand substituent effect on high-spin(5T2) low-spin(1A1)transition in solid(dithiocyanato)bis(N-R-2-pyridinaldimine)iron(II)

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Title:	Intraligand substituent effect on high-spin(5T2) low-spin(1A1)transition in solid(dithiocyanato)bis(N-R-2-pyridinaldimine)iron(II)
Authors:	魏和祥;Wei, Ho-hsiang;高世平;Kao, S. P.
Contributors:	淡江大學化學學系
Keywords:	Mossbauer effect;iron-complexes
Date:	1985-12
Issue Date:	2013-06-07 10:32:37 (UTC+8)
Publisher:	臺北市：中國化學學會
Abstract:	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. 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.
Relation:	中國化學會會誌=Journal of the Chinese Chemical Society 32(4)，頁399-403
DOI:	無
Appears in Collections:	[Graduate Institute & Department of Chemistry] Journal Article

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