10- (Q = S or Se): Facile Synthesis and Properties of the Most Highly Charged Octahedral Cluster Complexes and High Magnetic Relaxivity of Their Colloids with Gd3+ Ions

Konstantin A. Brylev, Bulat S. Akhmadeev, Julia G. Elistratova, Irek R. Nizameev, Aidar T. Gubaidullin, Kirill V. Kholin, Ilya V. Kashnik, Noboru Kitamura, Sung Jin Kim, Yuri V. Mironov, Asiya R. Mustafina

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

New octahedral rhenium cluster complexes [{Re6Q8}(SO3)6]10- (Q = S or Se) were synthesized starting from [{Re6Q8}(H2O)4(OH)2]·12H2O. The complexes were crystallized as sodium salts and characterized by X-ray single-crystal diffraction and elemental analyses, IR, UV/vis and luminescence spectroscopies. Magnetic relaxation data demonstrate the complex formation of the cluster units with gadolinium ions. The analysis of the magnetic relaxation rates measured at various Gd:cluster ratios and different concentrations revealed the conversion of the aggregates (Gdx[{Re6Se8}(SO3)6]y)n- into a nanoparticulate form even at x = 1 and y ≥ 1. Thus, the self-assembly of the cluster units into the nanoparticles is greatly facilitated by counterion binding with sodium cations. The concentration conditions were optimized for the formation and hydrophilization of NaxGdy[{Re6Q8}(SO3)6]-based colloids with the magnetic relaxivity values of r1(2) = 21.0(24.1) and r1(2) = 25.9(29.8) mM-1 s-1 for the {Re6S8}2+ and {Re6Se8}2+ derivatives, respectively.

Original languageEnglish
Pages (from-to)15889-15897
Number of pages9
JournalInorganic Chemistry
Volume58
Issue number23
DOIs
Publication statusPublished - 2 Dec 2019

Keywords

  • BUILDING-BLOCKS
  • COORDINATION POLYMERS
  • LIGANDS SYNTHESIS
  • LUMINESCENCE
  • REDOX
  • LN

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