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Inne
A new molecular building blocks : synthesis, crystal structure, magnetic and spectroscopic properties of Cu(II) and Ni(II) macrocyclic complexes.
Autorzy
Rok wydania
2011
Czasopismo
Numer woluminu
30
Strony
2550-2557
DOI
10.1016/j.poly.2011.06.031
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
New higly unsaturated macrocyclic building blocks [CuLSCN]·ClO4 (1) (L = N-dl-5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene) and [NiL(SCN)2] (2) (L = N-dl-5,12-dimethyl-7,14-diisopropyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene) were synthesized and the crystal structures of both compounds were determined. Both complexes crystallizes in monoclinic, space group P21/n (1) and P21/c (2). Their magnetic properties were studied over the temperature range 1.8–300 K using a Quantum Design SQUID magnetometer (MPMSXL-5-type). The results indicate that both compounds behave as weakly interacting paramagnetic centers in the crystal lattice. The effects of hydrogen bond mediating the magnetic exchange interactions on the spin density have been evidenced by DFT calculations. The NIR–Vis–UV diffuse-reflectance electronic spectra confirm the square pyramidal and octahedral geometry around Cu2+ and Ni2+ metal ions.
Słowa kluczowe
building block, Pentacoordinate Cu(II) complex, macrocyclic complexes, Exchange interactions
Adres publiczny
https://doi.org/10.1016/j.poly.2011.06.031
Strona internetowa wydawcy
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