Synthesis, Structure, and Magnetic Properties
of a Copper(II) Chloride Complex
with 3-Amino-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one:
The Crystal Structure of Cu₂Cl₆(C₉H₁₀N₃O)₂ (C₉H₁₀N₃O)Cl

N. E. Kuz’mina*, K. K. Palkina*, N. V. Polyakova**, I. N. Golubev***,
A. N. Medvedev***, O. V. Koval’chukova**, S. B. Strashnova**,
N. I. Mordovina**, S. V. Nikitin**, and B. E. Zaitsev**

* Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia

** Peoples’ Friendship University, ul. Miklukho-Maklaya 6, Moscow, 117198 Russia

*** Russian Research Institute of Organic Chemistry and Technology,
sh. Entuziastov 23, Moscow, 111024 Russia

Received April 26, 2002

Abstract—The complex Cu₂Cl₆(C₉H₁₀N₃O)₂ · (C₉H₁₀N₃O)Cl has been synthesized by the reaction between
copper(II) chloride crystal hydrate and 3-amino-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one, and its crystal
structure has been determined. The Cu₂Cl₆(C₉H₁₀N₂O)₂ is a centrosymmetric dimer in which two copper atoms
are linked by two bridging chlorine atoms. The hexachlorodicuprate anion contained in the dimer has a twice-
folded conformation. The copper atom (CN = 5) coordinates two chlorine atoms and the amino-group nitrogen
of the organic cation. An EPR study revealed the antiferromagnetic properties of the complex.

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