Heteroleptic iron(ii) complexes with naphthoquinone-type ligands

Shiga, Takuya; Kumamaru, Rina; Newton, Graham N.; Oshio, Hiroki

Abstract

Heteroleptic iron complexes with a naphthoquinone-type ligand, 2-(pyridin-2-yl)-1H-naphtho[2,3-d]imidazole-4,9-dione (HL), were synthesized, and their structures and magnetic properties were investigated. Two spin-crossover complexes, [Fe(L)2(L1)] (1, L1 = ethylenediamine) and [Fe(L)2(L2)] (2, L2 = cyclohexanediamine) were structurally characterized at 100 K and 270 K, and their gradual spin crossover behavior observed by magnetic susceptibility measurements and confirmed by Mössbauer spectroscopic analyses. Two homologous iron(ii) complexes, [Fe(L)2(L3c)] (3, L3c = diimino benzoquinone) and [Fe(L)2(L4c)] (4, L4c = iminosuccinonitrile), were found to exist in the low-spin state in the range of 10-300 K. In contrast, the corresponding complex with two water ligands, [Fe(L)2(H2O)2] (5), and the tris-chelate complex with protonated ligands (HL), [Fe(HL)3](BF4)2 (6), were found to be high-spin.

Citation

Shiga, T., Kumamaru, R., Newton, G. N., & Oshio, H. (2020). Heteroleptic iron(ii) complexes with naphthoquinone-type ligands. Dalton Transactions, 49(5), 1485-1491. https://doi.org/10.1039/c9dt03946e

• Journal Article Type: Article
• Acceptance Date: Dec 27, 2019
• Online Publication Date: Jan 9, 2020
• Publication Date: Jan 9, 2020
• Deposit Date: Jan 11, 2020
• Publicly Available Date: Jan 10, 2021
• Journal: Dalton Transactions
• Print ISSN: 1477-9226
• Electronic ISSN: 1477-9234
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 49
• Issue: 5
• Pages: 1485-1491
• DOI: https://doi.org/10.1039/c9dt03946e
• Keywords: Inorganic Chemistry
• Public URL: https://nottingham-repository.worktribe.com/output/3706134
• Publisher URL: https://pubs.rsc.org/en/content/articlelanding/2020/DT/C9DT03946E
• Additional Information: : This document is Similarity Check deposited; : Supplementary Information; : Crystal Structure Data; : Takuya Shiga (ORCID); : Takuya Shiga (ResearcherID); : Graham N. Newton (ORCID); : Graham N. Newton (ResearcherID); : Hiroki Oshio (ORCID); : Single-blind; : Received 7 October 2019; Accepted 27 December 2019; Advance Article published 9 January 2020