Research output: Contribution to journal › Article › peer-review
Hydrated and anhydrous cobalt (II) barbiturates : Crystal structures, spectroscopic and thermal properties. / Golovnev, Nicolay N.; Solovyov, Leonid A.; Lesnikov, Maxim K. et al.
In: Inorganica Chimica Acta, Vol. 467, 01.10.2017, p. 39-45.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Hydrated and anhydrous cobalt (II) barbiturates
T2 - Crystal structures, spectroscopic and thermal properties
AU - Golovnev, Nicolay N.
AU - Solovyov, Leonid A.
AU - Lesnikov, Maxim K.
AU - Vereshchagin, Sergey N.
AU - Atuchin, Victor V.
PY - 2017/10/1
Y1 - 2017/10/1
N2 - Three new complexes of barbituric acid (H2BA), a discrete molecular complex [Co(H2O)4(HBA)2] (1), a barbiturate-bridged 1D Co(II) coordination polymer [Co(H2O)2(μ2-HBA)2] (2) and a 3D Co(II) coordination polymer [Co(μ3-HBA)2] (3) were synthesized and structurally characterized by X-ray powder diffraction. In 1–3, the HBA− ions are coordinated to Co(II) only through O atoms with cobalt ions in an octahedral environment. In 1, Co(II) is coordinated to four terminal water molecules and two HBA− ions. In compound 2, Co(II) is bonded to two terminal water molecules and two μ2-HBA− ions forming polymer chains. In the 3D-polymeric form 3, a bridging μ3-HBA ligand is connected through three oxygen atoms of the carbonyl groups with three Co(II) ions. All three structures are stabilized by intermolecular hydrogen bonds and π–π stacking interactions between HBA− ions. The IR spectroscopic data supports the results of the X-ray diffraction analysis. The thermal decomposition of the compounds comprises the dehydration steps and the organic ligand oxidation to form cobalt oxides.
AB - Three new complexes of barbituric acid (H2BA), a discrete molecular complex [Co(H2O)4(HBA)2] (1), a barbiturate-bridged 1D Co(II) coordination polymer [Co(H2O)2(μ2-HBA)2] (2) and a 3D Co(II) coordination polymer [Co(μ3-HBA)2] (3) were synthesized and structurally characterized by X-ray powder diffraction. In 1–3, the HBA− ions are coordinated to Co(II) only through O atoms with cobalt ions in an octahedral environment. In 1, Co(II) is coordinated to four terminal water molecules and two HBA− ions. In compound 2, Co(II) is bonded to two terminal water molecules and two μ2-HBA− ions forming polymer chains. In the 3D-polymeric form 3, a bridging μ3-HBA ligand is connected through three oxygen atoms of the carbonyl groups with three Co(II) ions. All three structures are stabilized by intermolecular hydrogen bonds and π–π stacking interactions between HBA− ions. The IR spectroscopic data supports the results of the X-ray diffraction analysis. The thermal decomposition of the compounds comprises the dehydration steps and the organic ligand oxidation to form cobalt oxides.
KW - Barbiturate
KW - Cobalt
KW - Spectroscopy
KW - Structure
KW - Synthesis
KW - Thermal decomposition
KW - POLYMERS
KW - ANION
KW - ACID-DERIVATIVES
KW - CHROMOPHORES
KW - CHEMISTRY
KW - NI
KW - METAL-COMPLEXES
UR - http://www.scopus.com/inward/record.url?scp=85026258110&partnerID=8YFLogxK
U2 - 10.1016/j.ica.2017.07.002
DO - 10.1016/j.ica.2017.07.002
M3 - Article
AN - SCOPUS:85026258110
VL - 467
SP - 39
EP - 45
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
SN - 0020-1693
ER -
ID: 9958909