Formation of a Polynuclear Cobalt(II) Complex
on a Polydentate Nanoplatform of Carboxylated Boltorn H20

M. P. Kutyreva^a, N. A. Ulakhovich^a, F. Kh. Karataeva^a, M. V. Rezepova^a, and G. A. Kutyrev^b

^a Kazan (Volga Region) Federal University, ul. Kremlevskaya 18, Kazan, Tatarstan, 420008 Russia

^b Kazan National Research Technological University, ul. Karla Marksa 68, Kazan, Tatarstan, 420015 Russia

Received July 10, 2009

Abstract—A method of synthesis of a polynuclear cobalt(II) complex with carboxylated Boltorn H20, a hyper-
branched polyol of second generation, has been suggested. The logarithm of stability constant and the compo-
sition of the complex species BH20(OC(O)CH₂CH₂COO)₁₂Co₁₂ in a 50% acetone solution have been calculated
from the electronic absorption spectra: log = 13.7 0.2 and the composition M: L = 12 : 1. The IR spectros-
copy and NMR (¹³C and ¹H) point to the coordination of Co(II) ions not only at the surface of the molecule but
also near its core.

DOI: 10.1134/S0036023612090136

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