Asymmetric spin crossover behaviour and evidence of light-induced excited spin state trapping in a dinuclear iron(II) helicate.
نویسندگان
چکیده
Reported herein are the synthesis, structural and magnetic characterisation of a dinuclear FeII triple helicate that displays an unprecedented reversible asymmetric high spin to low spin crossover characterised by a thermal hysteresis: indeed the high spin state can be recovered by white light irradiation at 10 K.
منابع مشابه
Asymmetric spin crossover behaviour and evidence of light-induced excited spin state trapping in a dinuclear iron(II) helicatew
Currently there is an ever increasing interest in spin crossover compounds, partly motivated by their potential application as molecular memory or visual display devices, which has led to a better understanding of the parameters (temperature, pressure, light, structure etc.) that influence this fascinating phenomenon. Spin crossover is best exemplified by the low spin Fe (S = 0) to high spin Fe...
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Reported herein are the synthesis, structural, magnetic and Mössbauer spectroscopic characterisation of a dinuclear Fe(II) triple helicate complex [Fe(2)(L)(3)](ClO(4))(4).xH(2)O (x = 1-4), 1(H(2)O), where L is a bis-bidentate imidazolimine ligand. Low temperature structural analysis (150 K) and Mössbauer spectroscopy (4.5 K) are consistent with one of the Fe(II) centres within the helicate bei...
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The phenomenon of spin-crossover (SCO), which implies a thermally induced transition from a low spin (LS) ground state to a high spin (HS) excited state (or the reverse) in metal-based molecular complexes has been demonstrated for derivatives of ions with d4, d5, d6 and d7 configurations and is observed for all these in complexes of the first transition series.1 SCO processes can also be trigge...
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A mononuclear Fe(ii) complex involving a tetrathiafulvalene-based ligand exhibits thermal spin-crossover (around 143 K) with pronounced hysteresis behaviour (48 K). The chromophoric and π-extended ligand allows Near-Infrared (NIR) sensitization for the light-induced excited spin-state trapping (LIESST) with T(LIESST) = 90 K.
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Two new dinuclear iron(II) complexes (1·PF6 and 1·AsF6) of the general formula [Fe2(L2)2](X)4·nH2O·mMeCN (X = PF6, n = m = 1.5 for 1·PF6 and X = AsF6, n = 3, m = 1 for 1·AsF6) have been prepared and structurally characterized, where L2C3 is a bis-1,2,3-triazolimine type Schiff-base ligand, 1,1′-[propane-1,3-diylbis(1H-1,2,3-triazole-1,4-diyl)]bis{N-[2-(pyridin-2-yl)ethyl]methanimine}. Single cr...
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ورودعنوان ژورنال:
- Chemical communications
دوره 2 شماره
صفحات -
تاریخ انتشار 2009