Spin crossover in a series of iron(II) complexes of 2-(2-alkyl-2H-tetrazol-5-yl)-1,10-phenanthroline: Effects of alkyl side chain, solvent, and anion

doi:10.1021/ic062062h

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	Spin crossover in a series of iron(II) complexes of 2-(2-alkyl-2H-tetrazol-5-yl)-1,10-phenanthroline: Effects of alkyl side chain, solvent, and anion
	Zhang, Wen; Zhao, Fei; Liu, Tao; Yuan, Mei; Wang, Zhe-Ming; Gao, Song
刊名	INORGANIC CHEMISTRY
	2007-04-02
卷号	46 期号:7 页码:2541-2555
ISSN号	0020-1669
DOI	10.1021/ic062062h
英文摘要	2-(2H-Tetrazol-5-yl)-1,10-phenanthroline (HL0), its alkyl-substituted derivatives (L-n, where n = 1 - 8, 10, 12, 14, and 16, denoting the carbon atom number of the alkyl chain) at the 2H position of the tetrazole ring, and their iron(II) complexes (a for [Fe(L-0)(2)], n a for [Fe(L-n)(2)](ClO4)(2), and nb for [Fe(L-n)(2)](BF4)(2)) were synthesized and characterized. The crystal structures of a, a center dot CH3OH, 1a center dot CH3OH, 1b center dot CH3OH center dot CH3CN, 2a center dot H2O, 2b center dot H2O, 4b center dot CH3OH, 5a center dot H2O, 5b center dot H2O, 6a, 6b, 7a, 7b, and 16a are described, along with thermal analyses. a undergoes an abrupt spin crossover (SCO) at 255 K with a hysteresis loop of 6 K. a center dot CH3OH, 2a center dot H2O, and 2b center dot H2O exhibit irreversible SCO behaviors due to the loss of solvent molecules upon heating. 3a, 3b, 4a, and 5a center dot H2O show simple spin transitions above 350 K. The desolvated samples of 4b center dot CH3OH and 5b center dot H2O undergo two-step spin transitions. 16a exhibits a two-step SCO behavior between 100 and 300 K, corresponding to sequential phase transitions from the low-spin (LS) phase to the intermediate phase and then to the high-spin phase, respectively, proved by crystal structure analysis and Fe-57 Mossbauer spectroscopy. 1a center dot CH3OH, 10a, 10b, 12a, 12b, 14a, 14b, and 16b show gradual and incomplete SCO behaviors after cooling down from 400 K. 1b center dot CH3OH center dot CH3CN, 6a, 6b, 7a, 7b, 8a, and 8b remain in the LS state even at 400 K. This proves that the alkyl side chains, together with the solvent molecules and anions, play a crucial role in the complicated SCO behaviors in this system.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000245135900029
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/61813]
专题	中国科学院化学研究所
通讯作者	Wang, Zhe-Ming
作者单位	Peking Univ, Beijing Natl Lab Mol Sci, State Key Lab Rare Earth Mat Chem & Applicat, Coll Chem & Mol Engn, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Wen,Zhao, Fei,Liu, Tao,et al. Spin crossover in a series of iron(II) complexes of 2-(2-alkyl-2H-tetrazol-5-yl)-1,10-phenanthroline: Effects of alkyl side chain, solvent, and anion[J]. INORGANIC CHEMISTRY,2007,46(7):2541-2555.
APA	Zhang, Wen,Zhao, Fei,Liu, Tao,Yuan, Mei,Wang, Zhe-Ming,&Gao, Song.(2007).Spin crossover in a series of iron(II) complexes of 2-(2-alkyl-2H-tetrazol-5-yl)-1,10-phenanthroline: Effects of alkyl side chain, solvent, and anion.INORGANIC CHEMISTRY,46(7),2541-2555.
MLA	Zhang, Wen,et al."Spin crossover in a series of iron(II) complexes of 2-(2-alkyl-2H-tetrazol-5-yl)-1,10-phenanthroline: Effects of alkyl side chain, solvent, and anion".INORGANIC CHEMISTRY 46.7(2007):2541-2555.