@article{46df9f194e2846baafd00b2c9a388735,
title = "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",
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.",
author = "Brylev, {Konstantin A.} and Akhmadeev, {Bulat S.} and Elistratova, {Julia G.} and Nizameev, {Irek R.} and Gubaidullin, {Aidar T.} and Kholin, {Kirill V.} and Kashnik, {Ilya V.} and Noboru Kitamura and Kim, {Sung Jin} and Mironov, {Yuri V.} and Mustafina, {Asiya R.}",
note = "Funding Information: We acknowledge the Russian Science Foundation for financial support. In particular, K.A.B., I.V.K. and Y.V.M. express thanks for Grant RSF No. 19-73-20196, while B.S.A., J.G.E., I.R.N., A.T.G., and A.R.M. are indebted to Grant RSF No. 17-13-01013. Also, K.A.B. thanks the Brain Pool Program of the Korean Federation of Science and Technology Societies (KOFST) funded by the Ministry of Science, ICT and Future Planning (151-S-1-3-1190). Some experimental measurements were performed in “Center for Optical and Laser Materials Research” (St. Petersburg State University, St. Petersburg, Russian Federation). Publisher Copyright: {\textcopyright} 2019 American Chemical Society.",
year = "2019",
month = dec,
day = "2",
doi = "10.1021/acs.inorgchem.9b02346",
language = "English",
volume = "58",
pages = "15889--15897",
journal = "Inorganic Chemistry",
issn = "0020-1669",
publisher = "American Chemical Society",
number = "23",
}