The role of 2-hydroxypyridine in the formation of pivalate Zn–Gd complexes

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Abstract

The reactions of [Zn(Piv)2]n and [Gd(Piv)3]n or Gd(NO3)3 ∙ 6H2O with 2-hydroxypyridine (Hhp) or its 6-methyl derivative (Hmhp) afford heterometallic complexes [ZnGd(Рiv)5(Hhp)2] · 0.5H2O (I), [Zn2Gd (Рiv)6(Hhp)2NO3] ∙ 2C6H6 (II), [Zn3GdO(Рiv)7(Hmhp)2] ∙ MeCN (III) и [Zn2Gd(Рiv)6(Hmhp)2NO3] ∙ ∙ 0.5MeCN (IV) respectively. In the carboxylate metal cage of the synthesized complexes, the Hhp and Hmhp molecules in the form of 2-pyridone are coordinated by the metal atoms via the monodentate mode through the oxygen atoms. The introduction of Et3N into the reaction with [Zn(Рiv)2]n, Gd(NO3)3 ∙ 6H2O, and Hhp is found to result in the formation of compound [Zn4Gd2(OH)2(Рiv)6(hp)6(Hhp)2] (V) in which the 2-hydroxypyridine anions perform the bridging function. The molecular structures of complexes I‒V are determined by XRD (CIF files CCDC nos. 2365419–2365423).

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About the authors

M. E. Nikiforova

Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

Author for correspondence.
Email: nikiforova.marina@gmail.com
Russian Federation, Moscow

M. A. Kiskin

Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

Email: nikiforova.marina@gmail.com
Russian Federation, Moscow

A. A. Sidorov

Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

Email: nikiforova.marina@gmail.com
Russian Federation, Moscow

M. A. Uvarova

Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

Email: nikiforova.marina@gmail.com
Russian Federation, Moscow

I. L. Eremenko

Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

Email: nikiforova.marina@gmail.com
Russian Federation, Moscow

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Supplementary files

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2. Fig. 1. The structure of binuclear complex I (from here on, hydrogen atoms in tert-butyl substituents and at carbon atoms of the pyridine ring are not shown; the solvate water molecule is not shown) and the system of intra- and intermolecular hydrogen bonds. From here on, hydrogen bonds are shown as grey dotted lines.

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3. Scheme 1. Formation of compounds I–V

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4. Fig. 2. Structure of trinuclear complex II and the system of intermolecular hydrogen bonds and stacking interaction with solvated benzene.

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5. Fig. 3. Structure of complex III, solvate molecule not shown.

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6. Fig. 4. Structure of trinuclear complex IV and intermolecular hydrogen bond between molecules.

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7. Fig. 5. Structure of the six-nuclear complex V.

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8. Fig. 6. Crystal packing of compound I along the crystallographic axis a (a) and axis b (b) (hydrogen atoms of solvate water molecules are not shown).

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9. Fig. 7. Crystal packing of compound II.

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10. Fig. 8. Crystal packing of complex III along the a axis (a) and the c axis (b).

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11. Fig. 9. Crystal packing of complex IV along the b axis (a) and along the c axis (b).

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12. Fig. 10. The system of hydrogen bonds and intra- and intermolecular stacking interactions in compound V.

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13. Fig. 11. Crystal packing view of hexanuclear complex V along the a axis.

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