TY - JOUR
T1 - 2D H-bonding molecular magnets based on [Ni(mnt)2]- monoanion
T2 - Syntheses, crystal structures and magnetic properties
AU - Ren, X. M.
AU - Nishihara, S.
AU - Noro, S.
AU - Akutagawa, T.
AU - Nakamura, T.
PY - 2007/6/15
Y1 - 2007/6/15
N2 - Two new H-bonding molecular magnets based on [Ni(mnt)2]- monoanion have been synthesized and characterized structurally. In crystal of 1, [Ni(mnt)2]- monoanions form the π-stacked sheets and the neighboring anionic sheets are held together via H-bonding interactions between -NH groups of diprotonated benzene-1,4-diamine and CN groups of mnt2- ligands. In crystal of 2, the neighboring anionic dimers form an anionic column via Ni...S contacting interactions, and these anionic stacks arrange into a sheet which is parallel to crystallographic ab-plane. The H-bonding interactions between diprotonated 1,4-diazabicyclo[2.2.2]octane cations and [Ni(mnt)2]- monoanions as well as between cations and solvent MeCN molecules stabilize the lattice. Magnetic susceptibility measurement for 1 indicates an activated magnetic behavior in the high-temperature range together with a Curie tail at the lower temperature range, but the magnetic feature deviates from the magnetic exchange model for a spin dimer with S = 1/2. The magnetic nature of 2 reveals the presence of strongly antiferromagnetic interactions between the nearest-neighboring spins, the larger energy gap between spin ground and excited states results in a weakly paramagnetic property.
AB - Two new H-bonding molecular magnets based on [Ni(mnt)2]- monoanion have been synthesized and characterized structurally. In crystal of 1, [Ni(mnt)2]- monoanions form the π-stacked sheets and the neighboring anionic sheets are held together via H-bonding interactions between -NH groups of diprotonated benzene-1,4-diamine and CN groups of mnt2- ligands. In crystal of 2, the neighboring anionic dimers form an anionic column via Ni...S contacting interactions, and these anionic stacks arrange into a sheet which is parallel to crystallographic ab-plane. The H-bonding interactions between diprotonated 1,4-diazabicyclo[2.2.2]octane cations and [Ni(mnt)2]- monoanions as well as between cations and solvent MeCN molecules stabilize the lattice. Magnetic susceptibility measurement for 1 indicates an activated magnetic behavior in the high-temperature range together with a Curie tail at the lower temperature range, but the magnetic feature deviates from the magnetic exchange model for a spin dimer with S = 1/2. The magnetic nature of 2 reveals the presence of strongly antiferromagnetic interactions between the nearest-neighboring spins, the larger energy gap between spin ground and excited states results in a weakly paramagnetic property.
KW - Bis(maleonitriledithiolato)nickelate compound
KW - Crystal structure
KW - H-bonding interaction
KW - Magnetic property
UR - http://www.scopus.com/inward/record.url?scp=34249686633&partnerID=8YFLogxK
U2 - 10.1016/j.poly.2006.09.016
DO - 10.1016/j.poly.2006.09.016
M3 - 文章
AN - SCOPUS:34249686633
SN - 0277-5387
VL - 26
SP - 1787
EP - 1792
JO - Polyhedron
JF - Polyhedron
IS - 9-11
ER -