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Perturbing the spin state and conduction of Fe (II) spin crossover complexes with TCNQ
- 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;
- Zhang, Jian;
- N'Diaye, Alpha T;
- Klewe, Christoph;
- Shafer, Padraic;
- Lai, Rebecca Y;
- Streubel, Robert;
- Cheng, Ruihua;
- Shatruk, Michael;
- Dowben, Peter A
- et al.
Abstract
We investigated modifications driven by 7,7,8,8-tetracyanoquinodimethane (TCNQ) to the spin state configuration of [Fe(3-bpp)2](TCNQ)2 co-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)2 co-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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