Issue 5, 2023

Electronic structure of cobalt valence tautomeric molecules in different environments

Abstract

Future molecular microelectronics require the electronic conductivity of the device to be tunable without impairing the voltage control of the molecular electronic properties. This work reports the influence of an interface between a semiconducting polyaniline polymer or a polar poly-D-lysine molecular film and one of two valence tautomeric complexes, i.e., [CoIII(SQ)(Cat)(4-CN-py)2] ↔ [CoII(SQ)2(4-CN-py)2] and [CoIII(SQ)(Cat)(3-tpp)2] ↔ [CoII(SQ)2(3-tpp)2]. The electronic transitions and orbitals are identified using X-ray photoemission, X-ray absorption, inverse photoemission, and optical absorption spectroscopy measurements that are guided by density functional theory. Except for slightly modified binding energies and shifted orbital levels, the choice of the underlying substrate layer has little effect on the electronic structure. A prominent unoccupied ligand-to-metal charge transfer state exists in [CoIII(SQ)(Cat)(3-tpp)2] ↔ [CoII(SQ)2(3-tpp)2] that is virtually insensitive to the interface between the polymer and tautomeric complexes in the CoII high-spin state.

Graphical abstract: Electronic structure of cobalt valence tautomeric molecules in different environments

Supplementary files

Article information

Article type
Communication
Submitted
06 Dec. 2022
Accepted
22 Dec. 2022
First published
23 Dec. 2022

Nanoscale, 2023,15, 2044-2053

Author version available

Electronic structure of cobalt valence tautomeric molecules in different environments

E. Mishra, T. K. Ekanayaka, T. Panagiotakopoulos, D. Le, T. S. Rahman, P. Wang, K. A. McElveen, J. P. Phillips, M. Zaid Zaz, S. Yazdani, A. T. N'Diaye, R. Y. Lai, R. Streubel, R. Cheng, M. Shatruk and P. A. Dowben, Nanoscale, 2023, 15, 2044 DOI: 10.1039/D2NR06834F

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