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Issue 5, 2020
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Heteroleptic iron(ii) complexes with naphthoquinone-type ligands†

Takuya Shiga, ORCID logo *a   Rina Kumamaru,a   Graham N. Newton ORCID logo b  and  Hiroki Oshio ORCID logo ac  
Author affiliations

* Corresponding authors

a Graduate School of Pure and Applied Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki 305-8571, Japan
E-mail: shiga@chem.tsukuba.ac.jp

b GSK Carbon Neutral Laboratories for Sustainable Chemistry, The University of Nottingham, Nottingham NG7 2GA, UK

c State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Rd., 116024 Dalian, China

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.

Graphical abstract: Heteroleptic iron(ii) complexes with naphthoquinone-type ligands

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Article information

https://doi.org/10.1039/C9DT03946E
Submitted
07 Oct 2019
Accepted
27 Dec 2019
First published
09 Jan 2020
Dalton Trans., 2020,49, 1485-1491
Article type
Paper
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Heteroleptic iron(II) complexes with naphthoquinone-type ligands

T. Shiga, R. Kumamaru, G. N. Newton and H. Oshio, Dalton Trans., 2020, 49, 1485
DOI: 10.1039/C9DT03946E

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