Synthesis, crystal molecular structure, and magnetic characteristics of coordination polymers formed by Co() diketonates with pentaheterocyclic triphenodioxazines

Stable crystalline complexes of Co( ii ) acetylacetonate [Co( ii )(acac) 2 ], trifluoacetylacetonate [Co( ii )(tfac) 2 ] and hexafluoroacetylacetonate [Co( ii )(hfac) 2 ] with triphenodioxazines (TPDOs) were synthesized and their structures studied using X-ray crystallography. In the crystal, comple...

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Veröffentlicht in:New journal of chemistry 2021-01, Vol.45 (1), p.34-313
Hauptverfasser: Aldoshin, Sergey, Ivakhnenko, Eugeny, Shilov, Gennadii, Tkachev, Valerii, Utenyshev, Andrei, Palii, Andreii, Dorovatovskii, Pavel, Kovalenko, Anastasiia, Morgunov, Roman, Metelitsa, Anatoly, Minkin, Vladimir
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container_issue 1
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container_title New journal of chemistry
container_volume 45
creator Aldoshin, Sergey
Ivakhnenko, Eugeny
Shilov, Gennadii
Tkachev, Valerii
Utenyshev, Andrei
Palii, Andreii
Dorovatovskii, Pavel
Kovalenko, Anastasiia
Morgunov, Roman
Metelitsa, Anatoly
Minkin, Vladimir
description Stable crystalline complexes of Co( ii ) acetylacetonate [Co( ii )(acac) 2 ], trifluoacetylacetonate [Co( ii )(tfac) 2 ] and hexafluoroacetylacetonate [Co( ii )(hfac) 2 ] with triphenodioxazines (TPDOs) were synthesized and their structures studied using X-ray crystallography. In the crystal, complexes [Co( ii )(tfac) 2 ]TPDO and [Co( ii )(hfac) 2 ]TPDO form infinite N Co N chains featuring 1D coordination polymeric structures, whereas in the [Co( ii )(acac) 2 ]TPDO complex, the Co(acac) 2 units fill only half of the possible crystallographic positions. The electron accepting trifluoro substituents in the diketonate moieties significantly enhance the thermal stability of the complexes with TPDO. Of all the complexes, only [Co( ii )(hfac) 2 ]TPDO does not dissociate into the components in solution. In all studied complexes, the Co( ii ) atom is in a high-spin state and has distorted octahedral surroundings. Distortion of the octahedral polyhedrons appears as axial stretching of the octahedrons along the Co-N bonds; it is due to the specific features of the crystalline structure of the metal polymeric chain in the compounds. Heteropentacyclic triphenodioxazines are shown to be efficient bridging ligands in the synthesis of 1D coordination polymers, whose structure and stability depend on the electron accepting properties of the substituents in the diketonate moieties.
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In the crystal, complexes [Co( ii )(tfac) 2 ]TPDO and [Co( ii )(hfac) 2 ]TPDO form infinite N Co N chains featuring 1D coordination polymeric structures, whereas in the [Co( ii )(acac) 2 ]TPDO complex, the Co(acac) 2 units fill only half of the possible crystallographic positions. The electron accepting trifluoro substituents in the diketonate moieties significantly enhance the thermal stability of the complexes with TPDO. Of all the complexes, only [Co( ii )(hfac) 2 ]TPDO does not dissociate into the components in solution. In all studied complexes, the Co( ii ) atom is in a high-spin state and has distorted octahedral surroundings. Distortion of the octahedral polyhedrons appears as axial stretching of the octahedrons along the Co-N bonds; it is due to the specific features of the crystalline structure of the metal polymeric chain in the compounds. 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In the crystal, complexes [Co( ii )(tfac) 2 ]TPDO and [Co( ii )(hfac) 2 ]TPDO form infinite N Co N chains featuring 1D coordination polymeric structures, whereas in the [Co( ii )(acac) 2 ]TPDO complex, the Co(acac) 2 units fill only half of the possible crystallographic positions. The electron accepting trifluoro substituents in the diketonate moieties significantly enhance the thermal stability of the complexes with TPDO. Of all the complexes, only [Co( ii )(hfac) 2 ]TPDO does not dissociate into the components in solution. In all studied complexes, the Co( ii ) atom is in a high-spin state and has distorted octahedral surroundings. Distortion of the octahedral polyhedrons appears as axial stretching of the octahedrons along the Co-N bonds; it is due to the specific features of the crystalline structure of the metal polymeric chain in the compounds. 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subjects Chemical synthesis
Coordination polymers
Crystal structure
Crystallinity
Crystallography
Magnetic properties
Molecular structure
Octahedrons
Thermal stability
title Synthesis, crystal molecular structure, and magnetic characteristics of coordination polymers formed by Co() diketonates with pentaheterocyclic triphenodioxazines
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