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.

doi:10.1016/j.matchemphys.2022.127276

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

Journal Article · Wed Dec 28 00:00:00 EST 2022 · Materials Chemistry and Physics

DOI:https://doi.org/10.1016/j.matchemphys.2022.127276· OSTI ID:2282736

^[1]; Üngör, Ökten ^[2]; Hu, Yuchen ^[1]; Mishra, Esha ^[1]; ^[3]; ^[3]; Yazdani, Saeed ^[3]; Wang, Ping ^[2]; ^[1]; Zaz, M. Zaid ^[1]; Zhang, Jian ^[4]; N'Diaye, Alpha T. ^[5]; Klewe, Christoph ^[5]; Shafer, Padraic ^[5]; ^[1]; Streubel, Robert ^[1]; Cheng, Ruihua ^[3]; Shatruk, Michael ^[2]; ^[1]

Univ. of Nebraska, Lincoln, NE (United States)
Florida State Univ., Tallahassee, FL (United States)
Indiana Univ.-Purdue Univ. Indianapolis (IUPUI), Indianapolis, IN (United States)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

In this study, 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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Sponsoring Organization:: CHE-1955754; National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2282736

Alternate ID(s):: OSTI ID: 1907304

Journal Information:: Materials Chemistry and Physics, Journal Name: Materials Chemistry and Physics Vol. 296; ISSN 0254-0584

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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