TY - JOUR
T1 - Ferromagnetic end-to-end azides and tetrahedral cobalt
T2 - Unusual findings in the M-BPA-pseudohalide2 system
AU - De La Pinta, Noelia
AU - Fidalgo, M. Luz
AU - Lezama, Luis
AU - Madariaga, Gotzon
AU - Callejo, Lorena
AU - Cortés, Roberto
PY - 2011/4/6
Y1 - 2011/4/6
N2 - Two novel unusual compounds [Co(NCO)2(bpa)] (1) and [Cu(N 3)2(bpa)] (2) with cyanate and azide pseudohalides are shown in this work. These compounds have been characterized by X-ray diffraction measurements, Fourier transform-infrared (FT-IR) and UV-visible spectroscopies, thermogravimetric studies, electron spin resonance (ESR) spectroscopy, and magnetic measurements. Compound 1 shows a one-dimensional (1D) structure with the cobalt atoms bridged by bpa ligands and with the metal atoms showing an unusual tetrahedral coordination sphere. Compound 2 shows a two-dimensional (2D) structure, where the copper(II) ions are bridged by double 1,3-azido ligands to form chains that are joined through single bpa bridges to give the global 2D structure. Magnetic measurements show predominance of spin-orbit coupling for the cobalt compound (1), while ferromagnetic interactions, unusual for the 1,3-azido bridging, are observed in compound 2. This compound represents the first example of copper-double (μ1,3-azido)-bridged chain exhibiting ferromagnetic interactions through this kind of bridging.(Figure Presented)
AB - Two novel unusual compounds [Co(NCO)2(bpa)] (1) and [Cu(N 3)2(bpa)] (2) with cyanate and azide pseudohalides are shown in this work. These compounds have been characterized by X-ray diffraction measurements, Fourier transform-infrared (FT-IR) and UV-visible spectroscopies, thermogravimetric studies, electron spin resonance (ESR) spectroscopy, and magnetic measurements. Compound 1 shows a one-dimensional (1D) structure with the cobalt atoms bridged by bpa ligands and with the metal atoms showing an unusual tetrahedral coordination sphere. Compound 2 shows a two-dimensional (2D) structure, where the copper(II) ions are bridged by double 1,3-azido ligands to form chains that are joined through single bpa bridges to give the global 2D structure. Magnetic measurements show predominance of spin-orbit coupling for the cobalt compound (1), while ferromagnetic interactions, unusual for the 1,3-azido bridging, are observed in compound 2. This compound represents the first example of copper-double (μ1,3-azido)-bridged chain exhibiting ferromagnetic interactions through this kind of bridging.(Figure Presented)
UR - http://www.scopus.com/inward/record.url?scp=79953848667&partnerID=8YFLogxK
U2 - 10.1021/cg1015324
DO - 10.1021/cg1015324
M3 - Article
AN - SCOPUS:79953848667
SN - 1528-7483
VL - 11
SP - 1310
EP - 1317
JO - Crystal Growth and Design
JF - Crystal Growth and Design
IS - 4
ER -