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Conductive Self-Assembled Monolayers of Paramagnetic {CoII Co 4 III } and { Co 4 II Co 2 III } Coordination Clusters on Gold Surfaces

Schmitz, S., Qiu, X., Glöß, M., van Leusen, J., Izarova, N. V., Nadeem, M. A., Griebel, J., Chiechi, R. C., Kögerler, P. & Monakhov, K. Y., 2019, In : Frontiers in Chemistry. 7, 14 p., 681.

Research output: Contribution to journalArticleAcademicpeer-review

  • Sebastian Schmitz
  • Xinkai Qiu
  • Maria Glöß
  • Jan van Leusen
  • Natalya V Izarova
  • Muhammad Arif Nadeem
  • Jan Griebel
  • Ryan C Chiechi
  • Paul Kögerler
  • Kirill Yu Monakhov

Two polynuclear cobalt(II,III) complexes, [Co5(N3)4(N-n-bda)4(bza·SMe)2] (1) and [Co6(N3)4(N-n-bda)2(bza·SMe)5(MeOH)4]Cl (2), where Hbza·SMe = 4-(methylthio)benzoic acid and N-n-H2bda = N-n-butyldiethanolamine, were synthesized and fully characterized by various techniques. Compound 1 exhibits an unusual, approximately C2-symmetric {CoII Co 4 III } core of two isosceles Co3 triangles with perpendicularly oriented planes, sharing a central, high-spin CoII ion residing in a distorted tetrahedral coordination environment. This central CoII ion is connected to four outer, octahedrally coordinated low-spin CoIII ions via oxo bridges. Compound 2 comprises a semi-circular { Co 4 II Co 2 III } motif of four non-interacting high-spin CoII and two low-spin CoIII centers in octahedral coordination environments. Self-assembled monolayers (SAMs) of 1 and 2 were physisorbed on template-stripped gold surfaces contacted by an eutectic gallium-indium (EGaIn) tip. The acquired current density-voltage (I-V) data revealed that the cobalt-based SAMs are more electrically robust than those of the previously reported dinuclear {CuIILnIII} complexes with Ln = Gd, Tb, Dy, or Y (Schmitz et al., 2018a). In addition, between 170 and 220°C, the neutral, mixed-valence compound 1 undergoes a redox modification, yielding a {Co5}-based coordination cluster (1-A) with five non-interacting, high-spin octahedral CoII centers as indicated by SQUID magnetometry analysis in combination with X-ray photoelectron spectroscopy and infrared spectroscopy. Solvothermal treatment of 1 results in a high-nuclearity coordination cluster, [Co10(N3)2(N-n-bda)6(bza·SMe)6] (3), containing 10 virtually non-interacting high-spin CoII centers.

Original languageEnglish
Article number681
Number of pages14
JournalFrontiers in Chemistry
Volume7
Publication statusPublished - 2019

    Keywords

  • POLYNUCLEAR COBALT COMPLEXES, MAGNETIC-PROPERTIES, TRANSPORT CHARACTERISTICS, CHARGE-TRANSPORT, CO(II), SPECTROSCOPY, LIGAND

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