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Syntheses, structures and magnetic behaviors of 1D and 3D μ1,5-dicyanamide bridged copper(II) coordination polymers containing a symmetrical 1,2-diamine as a chelator.
Autorzy
Rok wydania
2020
Czasopismo
Numer woluminu
188
Strony
114693/1-114693/10
DOI
10.1016/j.poly.2020.114693
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Two neutral copper(II) coordination polymers, [Cu(en)(m1,5-dca)(dca)]n(1) and [Cu3(en)2(m1,5-dca)6]n(2)[en = 1,2-ethanediamine, dca = dicyanamide], withm1,5-dicyanamide bridges have been isolated. X-raystructural analysis reveals that each Cu(II) center in the asymmetric unit of1adopts a distorted squarepyramidal geometry with a CuN5chromophore ligated through two N atoms of the symmetrical 1,2-ethanediamine (en) ligand, one nitrile N atom of a terminal dca ligand and two nitrile N atoms of thel1,5bridging dca ligand.1is an example of coordination polymer containing bothl1,5-dca and terminaldca. Adjacent copper atoms are connected by dca ligands in thel1,5-bridging mode affording a 1D chainstructure. In the crystalline state, these 1D chains are further associated through weak intermolecularNAHN hydrogen bonds to form a 2D sheet structure, viewed along the crystallographicbaxis. Theasymmetric unit of2contains two types of copper(II) centers (Cu1and Cu2). Cu1adopts a distorted squarepyramidal geometry with a CuN5chromophore coordinated through two N atoms of the bidentate ligand(en) and three nitrile N atoms of three differentl1,5bridged dca ligands, whereas Cu2is connected to sixnitrile atoms of six differentl1,5bridged dca ligands, resulting in a distorted octahedral geometry with aCuN6chromophore. Adjacent copper atoms are connected byl1,5-bridging dca ligands to form a 3D net-work coordination polymer structure, which contains multiple NAH∙∙∙N hydrogen bonds in the crys-talline state. A variable-temperature magnetic susceptibility study shows very weak antiferromagneticinteractions among the neighboring metal centers through thel1,5-dca bridges withJ=0.12 cm1for complex1andJ=0.19 cm1for complex2.
Słowa kluczowe
1D and 3D CPs of copper(II), X-ray structure, EPR studies, magnetic properties, Terminal and μ1,5-bridged dca
Adres publiczny
http://doi.org/10.1016/j.poly.2020.114693
Strona internetowa wydawcy
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