Perturbing the spin state and conduction of Fe (II) spin crossover complexes with TCNQ

Perturbing the spin state and conduction of Fe (II) spin crossover complexes with TCNQ
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用 TCNQ 扰动 Fe (II) 自旋交叉配合物的自旋状态和传导

DOI:
10.1016/j.matchemphys.2022.127276
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发表时间:
2023
影响因子:
4.6
通讯作者:
Zaz, M. Zaid
Zaz, M. Zaid
中科院分区:
材料科学3区
文献类型:
--
作者:
Ekanayaka, Thilini K.;Üngör, Ökten;Hu, Yuchen;Mishra, Esha;Phillips, Jared P.;Dale, Ashley S.;Yazdani, Saeed;Wang, Ping;McElveen, Kayleigh A.;Zaz, M. Zaid

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研究了7,7,8,8-四氰基醌二甲烷(TCNQ)对[Fe(3-bpp)2](TCNQ)2共晶自旋态构型的修饰以及[Fe{H2 B(pz)2}2(bipy)]和TCNQ混合物的自旋态和电导率. [Fe(3-bpp)2](TCNQ)2共晶中的Fe 2+位置具有相当大的轨道矩。在X射线吸收测量过程中,铁离子被部分激发到高自旋态,并显示出较强的表面效应。混合TCNQ与[Fe{H2 B(pz)2}2(bipy)]自旋交叉复合物导致具有增加的导电性和漂移载流子寿命的分子组合。用二甲基甲酰胺(DMF)生长的含TCNQ的[Fe{H2 B(pz)2}2(bipy)]薄膜在很宽的温度范围内主要锁定在低自旋(LS)态,漂移载流子寿命接近0.5 s.当沉积到铁电聚偏氟乙烯-六氟丙烯薄膜衬底上时,[Fe{H2 B(pz)2}2(bipy)]显示出增强的晶体管载流子迁移率,这可能与含TCNQ的[Fe{H2 B(pz)2}2(bipy)]薄膜的阳离子特性增加有关。
We investigated modifications driven by 7,7,8,8-tetracyanoquinodimethane (TCNQ) to the spin state configuration of [Fe(3-bpp)2](TCNQ)2co-crystal and both spin state and electric conductivity of [Fe{H2B(pz)2}2(bipy)] and TCNQ mixtures. The Fe2+site in the [Fe(3-bpp)2](TCNQ)2co-crystal has a sizable orbital moment. During X-ray absorption measurements, the iron ion is partially excited to the high spin state and strong surface effects are indicated. Mixing TCNQ with the [Fe{H2B(pz)2}2(bipy)] spin crossover complex leads to a molecular combination with increased conductivity and drift carrier lifetimes. [Fe{H2B(pz)2}2(bipy)] thin films with TCNQ, grown using dimethylformamide (DMF), are to great extent locked mainly in the low spin (LS) state across a broad temperature range and exhibit drift carrier lifetimes approaching 0.5 s. When deposited onto a ferroelectric polyvinylidenefluoride-hexafluoropropylene thin film substrate, [Fe{H2B(pz)2}2(bipy)], shows enhanced transistor carrier mobility, likely associated with the increasing cationic character of [Fe{H2B(pz)2}2(bipy)] thin films with TCNQ.
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