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

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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.

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

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Publication details

The article was received on 26 Jan 2019, accepted on 14 Mar 2019 and first published on 14 Mar 2019


Article type: Research Article
DOI: 10.1039/C9QI00111E
Citation: Inorg. Chem. Front., 2019, Advance Article

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

    J. Yuan, M. Liu, S. Wu, X. Zhu, N. Zhang, O. Sato and H. Kou, Inorg. Chem. Front., 2019, Advance Article , DOI: 10.1039/C9QI00111E

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