Graphene oxide and reduced graphene oxide hybrids with spin crossover iron(iii) complexes

Yusuke Murashima, Mohammad Razaul Karim, Naoto Saigo, Hiroshi Takehira, Ryo Ohtani, Masaaki Nakamura, Michio Koinuma, Leonard F. Lindoy, Keita Kuroiwa, Shinya Hayami

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


Graphene (rGO) based hybrid materials exhibiting electrical conductivity and spin crossover (SCO) behavior are reported. The non-conductive [Fe(qnal)2]nGO (1·GO) and [Fe(qsal)2]nGO (2·GO) hybrids have been prepared by employing the electrostatic interaction between the negatively charged graphene oxide (GO) nanosheet and the respective iron(iii) complex cations in [Fe(qnal)2]+Cl- and [Fe(qsal)2]+Cl-. The conductive [Fe(qnal)2]nrGO (1·rGO) and [Fe(qsal)2]nrGO (2·rGO) hybrids were obtained by thermal reduction of 1·GO and 2·GO. 1·GO and 1·rGO exhibit SCO behavior, and 1·rGO also shows a light-induced excited spin state trapping (LIESST) effect. Thus, in 1·rGO the electrical conductivity of rGO and the SCO behavior of [Fe(qnal)2]+ coexist in a single structure. We propose that the observed cooperativity for the rGO nanosheet-bound iron(iii) [Fe(qnal)2]+ SCO material occurs through formation of large domains via π-π stacking between the graphene skeleton and the [Fe(qnal)2]+ cations.

Original languageEnglish
Pages (from-to)886-892
Number of pages7
JournalInorganic Chemistry Frontiers
Issue number10
Publication statusPublished - Oct 1 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Inorganic Chemistry


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