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Inne
Novel copper complexes based on the thiocyanate bridge - synthesis, X-ray studies and magnetic properties.
Autorzy
Rok wydania
2011
Czasopismo
Numer woluminu
30
Strony
832-840
DOI
10.1016/j.poly.2010.12.024
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Three novel compounds {[Cu(bpzm)(SCN)][Cu(bpzm)(MeOH)][Cu(SCN)4]}n (1a), {[Cu2(bpzm)2(μ-SCN)(SCN)3]}n (1b) and [Cu2(μ-SCN)2(SCN)2(dpa)2] (2) have been obtained in one-step self-assembly reaction of copper dichloride, a suitable N–N ligand (bis(pyrazol-1-yl)methane and 2,2′-dipyridylamine) and ammonium thiocyanate. For the reaction involving bis(pyrazol-1-yl)methane, an unprecedented in situ reduction of some Cu(II) ions to Cu(I) has been observed. The compound {[Cu(bpzm)(SCN)][Cu(bpzm)(MeOH)][Cu(SCN)4]}n (1a) belongs to a relatively scarce group of mixed-valence CuII/CuI coordination polymers with interesting polymeric architecture. It creates infinite two-dimensional structure consisting of layers extending along crystallographic plane (0 0 1), in which the cations [CuII(bpzm)(SCN)]+ and [CuII(bpzm)(MeOH)]2+ are connected by ions [CuI(SCN)4]3− through single end-to-end thiocyanato bridges. Structure 1b consists two crystallographically independent chains. The chain A has a zig-zag form and extends along the crystallographic direction [0 0 1], whereas the second chain is linear and runs along the crystallographic direction [0 1 0]. The structure 2 consists of dinuclear [Cu2(dpa)2(μ-SCN)2(SCN)2] units. Variable-temperature magnetic susceptibility measurements show very weak antiferromagnetic interactions between the paramagnetic centres Cu(II) centers inside the crystal lattices of three novel compounds.
Słowa kluczowe
coordination polymers, copper, Thiocyanate bridge, X-ray, magnetic measurements
Adres publiczny
https://doi.org/10.1016/j.poly.2010.12.024
Strona internetowa wydawcy
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