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A luminescent Pt2Fe spin crossover complex
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DOI：10.1039/c6dt04360g.png)
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摘要
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A heterotrinuclear [Pt2Fe] spin crossover (SCO) complex was developed and synthesized employing a ditopic bridging bpp-alkynyl ligand L and alkynyl coordinated PtII terpy units: [FeII(L-PtII)(2)](2)(BF4)(2) (1). We identified two different types of crystals of 1 which differ in their molecular packing and the number of co-crystallized solvent molecules: 1(H) (1 center dot 3.5CH(2)Cl(2) in P (1) over bar) and 1(L) (1 center dot 10CH(2)Cl(2) in C2/c); while 1(L) shows a reversible SCO with a transition temperature of 268 K, the analogous compound 1(H) does not show any SCO and remains blocked in the HS state. The temperature-dependent magnetic properties of 1(H) and 1(L) were complementarily studied by Mossbauer spectroscopy. It has been shown that 1(L) performs thermal spin crossover and that 1(L) can be excited to a LIESST state. The vibrational properties of 1 were investigated by experimental nuclear resonance vibrational spectroscopy. The experimentally determined partial density of vibrational states (pDOS) was compared to a DFT-based simulation of the pDOS. The vibrational modes of the different components were assigned and visualized. In addition, the photo-physical properties of 1 and L-Pt were investigated in the solid state and in solution. The ultrafast transient absorption spectroscopy of 1 in solution was carried out to study the PL quenching channel via energy transfer from photoexcited Pt-II terpy units to the Fe-II-moiety.
Keyword:
IRON(II) COMPLEXES
TERBIUM(III) COMPLEXES
COORDINATION CHEMISTRY
TRANSITION
SPECTROSCOPY
LIGANDS
METAL
PHOTOPHYSICS
MOSSBAUER
BINDING
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期刊
IF:
3.3
论文数:
3.3W
被引数:
7.5W
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