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Co(II) coordination polymers derived from α,α- disubstituted analogues of zoledronic acid and 4,4'-bipyridine : synthesis, structures and characterization.
Autorzy
Rok wydania
2020
Czasopismo
Numer woluminu
185
Strony
114594/1-114594/8
DOI
10.1016/j.poly.2020.114594
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Two isomorphous Co(II) coordination polymers were hydrothermally prepared using analogues of zoledronic acid functionalized at Cα carbon by a cyclobutane ring (H4cbtZol) or methyl groups (H4dmtZol), 4,4′-bipyridine (4,4′-bpy) and cobalt(II) acetate. The resulting crystalline materials, Co3(HcbtZol)2(4,4′-bpy)(H2O)4⋅10H2O (1) and [Co3(HdmtZol)2(4,4′-bpy)(H2O)4]·0.2NaOH⋅9.8H2O (2), were analysed by means of single-crystal X-ray diffraction, IR spectroscopy and thermal techniques.
Both 1 and 2 feature similar zig-zag [Co3(HcbtZol/HdmtZol)2(H2O)4] chains with crystallographically distinct Co1 and Co2 in slightly distorted octahedral geometries, assembled into 2D coordination layers by 4,4′-bpy. In both compounds, 3D supramolecular architecture is sustained by hydrogen bonds involving water of crystallization filling the cavities inside the network. Furthermore, in 2, an additional support provide Na1 ions linked by phosphonate O atoms and molecules of coordinated and crystallization water. The vibrational spectra of both compounds are in good agreement with crystal data.
Similarities in chain architectures of 1 and 2 and previously reported 1D M3(HL)2(H2O)6⋅6H2O (M = Co, Ni, HL3− = HdmtZol3−, HcbtZol3−) coordination polymers are discussed and differences in their thermal behavior explained in term of different 3D architectures.
Słowa kluczowe
Zoledronic acid, Coordination polymer, transition metal, X-ray crystallography, thermal stability
Adres publiczny
http://doi.org/10.1016/j.poly.2020.114594
Strona internetowa wydawcy
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