Substituent effects on the fluorescent spin-crossover Fe(ii) complexes of rhodamine 6G hydrazones

Juan Yuan; Mei Jiao Liu; Shu Qi Wu; Xin Zhu; Nan Zhang; Osamu Sato; Hui Zhong Kou

doi:10.1039/c9qi00111e

Substituent effects on the fluorescent spin-crossover Fe(ii) complexes of rhodamine 6G hydrazones

Juan Yuan, Mei Jiao Liu, Shu Qi Wu, Xin Zhu, Nan Zhang, Osamu Sato, Hui Zhong Kou

Department of Fundamental Organic Chemistry

Research output: Contribution to journal › Article › peer-review

24 Citations (Scopus)

Abstract

Two new complexes were constructed via the coordination of fluorophores with Fe(ii) ions to study the effects of ligand substituents on fluorescent-spin crossover (SCO) materials. Single-crystal structural determination suggests that the central iron(ii) of complexes 1-2 adopted an N₄O₂ coordination configuration, chelated by two ligands L¹ or L². The π⋯π stacking interaction between the π-conjugated xanthene groups of the adjacent ligands for complex 1 is apparently stronger than that for complex 2. Magnetic susceptibility measurements show that complex 1 is high spin, while complex 2 is diamagnetic at room temperature. Interestingly, the desolvated form 1-d of complex 1 exhibits SCO behavior (T_c = 175 K) without hysteresis. Significantly, complex 1-d displays the correlation between the spin crossover and the fluorescence.

Original language	English
Pages (from-to)	1170-1176
Number of pages	7
Journal	Inorganic Chemistry Frontiers
Volume	6
Issue number	5
DOIs	https://doi.org/10.1039/c9qi00111e
Publication status	Published - May 2019

All Science Journal Classification (ASJC) codes

Inorganic Chemistry

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10.1039/c9qi00111e

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title = "Substituent effects on the fluorescent spin-crossover Fe(ii) complexes of rhodamine 6G hydrazones",

abstract = "Two new complexes were constructed via the coordination of fluorophores with Fe(ii) ions to study the effects of ligand substituents on fluorescent-spin crossover (SCO) materials. Single-crystal structural determination suggests that the central iron(ii) of complexes 1-2 adopted an N4O2 coordination configuration, chelated by two ligands L1 or L2. The π⋯π stacking interaction between the π-conjugated xanthene groups of the adjacent ligands for complex 1 is apparently stronger than that for complex 2. Magnetic susceptibility measurements show that complex 1 is high spin, while complex 2 is diamagnetic at room temperature. Interestingly, the desolvated form 1-d of complex 1 exhibits SCO behavior (Tc = 175 K) without hysteresis. Significantly, complex 1-d displays the correlation between the spin crossover and the fluorescence.",

author = "Juan Yuan and Liu, {Mei Jiao} and Wu, {Shu Qi} and Xin Zhu and Nan Zhang and Osamu Sato and Kou, {Hui Zhong}",

note = "Funding Information: This work was supported by the NSFC (Project No. 21571113 and 21771115), the project of the Scientific and Technological in Henan Province (Project No. 172102310433), and the Key Scientific Research Project of Colleges and Universities in Henan Province (16A350006). The solid fluorescence spectra were obtained at the Analytical Instrumentation Center of Peking University. We thank Ming-Xing Chen for the help with the fluorescence measurements. Publisher Copyright: {\textcopyright} 2019 the Partner Organisations.",

year = "2019",

month = may,

doi = "10.1039/c9qi00111e",

language = "English",

volume = "6",

pages = "1170--1176",

journal = "Inorganic Chemistry Frontiers",

issn = "2052-1545",

publisher = "Royal Society of Chemistry",

number = "5",

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TY - JOUR

T1 - Substituent effects on the fluorescent spin-crossover Fe(ii) complexes of rhodamine 6G hydrazones

AU - Yuan, Juan

AU - Liu, Mei Jiao

AU - Wu, Shu Qi

AU - Zhu, Xin

AU - Zhang, Nan

AU - Sato, Osamu

AU - Kou, Hui Zhong

N1 - Funding Information: This work was supported by the NSFC (Project No. 21571113 and 21771115), the project of the Scientific and Technological in Henan Province (Project No. 172102310433), and the Key Scientific Research Project of Colleges and Universities in Henan Province (16A350006). The solid fluorescence spectra were obtained at the Analytical Instrumentation Center of Peking University. We thank Ming-Xing Chen for the help with the fluorescence measurements. Publisher Copyright: © 2019 the Partner Organisations.

PY - 2019/5

Y1 - 2019/5

N2 - Two new complexes were constructed via the coordination of fluorophores with Fe(ii) ions to study the effects of ligand substituents on fluorescent-spin crossover (SCO) materials. Single-crystal structural determination suggests that the central iron(ii) of complexes 1-2 adopted an N4O2 coordination configuration, chelated by two ligands L1 or L2. The π⋯π stacking interaction between the π-conjugated xanthene groups of the adjacent ligands for complex 1 is apparently stronger than that for complex 2. Magnetic susceptibility measurements show that complex 1 is high spin, while complex 2 is diamagnetic at room temperature. Interestingly, the desolvated form 1-d of complex 1 exhibits SCO behavior (Tc = 175 K) without hysteresis. Significantly, complex 1-d displays the correlation between the spin crossover and the fluorescence.

AB - Two new complexes were constructed via the coordination of fluorophores with Fe(ii) ions to study the effects of ligand substituents on fluorescent-spin crossover (SCO) materials. Single-crystal structural determination suggests that the central iron(ii) of complexes 1-2 adopted an N4O2 coordination configuration, chelated by two ligands L1 or L2. The π⋯π stacking interaction between the π-conjugated xanthene groups of the adjacent ligands for complex 1 is apparently stronger than that for complex 2. Magnetic susceptibility measurements show that complex 1 is high spin, while complex 2 is diamagnetic at room temperature. Interestingly, the desolvated form 1-d of complex 1 exhibits SCO behavior (Tc = 175 K) without hysteresis. Significantly, complex 1-d displays the correlation between the spin crossover and the fluorescence.

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JF - Inorganic Chemistry Frontiers

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Substituent effects on the fluorescent spin-crossover Fe(ii) complexes of rhodamine 6G hydrazones

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