TY - JOUR
T1 - Effect of counter cationic geometry on stacking structures and magnetic properties of [Ni(mnt)2]- complexes
AU - Duan, Hai Bao
AU - Zhou, Hong
AU - Tian, Zheng Fang
AU - Xuan, Fang
AU - Ren, Xiao Ming
PY - 2009/7
Y1 - 2009/7
N2 - The crystal structures and magnetic properties of two new ion-pair complexes, [N-NH2Py][Ni(mnt)2] (1) and [N-NH2Ql][Ni(mnt)2] (2) (N-NH2Py+ = 1-aminopyridinium, N-NH2Ql+ = 1-aminoquinolinium; mnt2- = maleonitriledithiolate) have been investigated. The differences of the molecular topology and size of the counter cation result in distinct anionic and cationic stacking patterns in the crystals, namely, in the crystal of 1 the anions (A) and cations (C) alternate to stack into a mixed column in the fashion of ...AACCAACC..., and the neighboring columns are connected together via intermolecular H-bonding interactions as well as van der Waals forces; while, in the crystal of 2, the anions and cations alternate to form a mixed columnar stack in the manner of ...ACAC..., and the adjacent columns are held together via weak van der Waals forces. Investigations of variable-temperature magnetic susceptibility indicated that 1 is a spin gap system but its magnetic behavior does not follow the Bleaney-Bowers spin dimer model; 2 shows a magnetic feature of linear decrease of χmT value upon cooling, and this kind of magnetic behavior is probably related to the presence of temperature independent paramagnetism.
AB - The crystal structures and magnetic properties of two new ion-pair complexes, [N-NH2Py][Ni(mnt)2] (1) and [N-NH2Ql][Ni(mnt)2] (2) (N-NH2Py+ = 1-aminopyridinium, N-NH2Ql+ = 1-aminoquinolinium; mnt2- = maleonitriledithiolate) have been investigated. The differences of the molecular topology and size of the counter cation result in distinct anionic and cationic stacking patterns in the crystals, namely, in the crystal of 1 the anions (A) and cations (C) alternate to stack into a mixed column in the fashion of ...AACCAACC..., and the neighboring columns are connected together via intermolecular H-bonding interactions as well as van der Waals forces; while, in the crystal of 2, the anions and cations alternate to form a mixed columnar stack in the manner of ...ACAC..., and the adjacent columns are held together via weak van der Waals forces. Investigations of variable-temperature magnetic susceptibility indicated that 1 is a spin gap system but its magnetic behavior does not follow the Bleaney-Bowers spin dimer model; 2 shows a magnetic feature of linear decrease of χmT value upon cooling, and this kind of magnetic behavior is probably related to the presence of temperature independent paramagnetism.
KW - Bis(maleonitriledithiolato)nickelate monoanion
KW - Crystal structure
KW - H-bonding interaction
KW - Magnetic property
UR - http://www.scopus.com/inward/record.url?scp=67349108337&partnerID=8YFLogxK
U2 - 10.1016/j.solidstatesciences.2009.03.013
DO - 10.1016/j.solidstatesciences.2009.03.013
M3 - 文章
AN - SCOPUS:67349108337
SN - 1293-2558
VL - 11
SP - 1216
EP - 1221
JO - Solid State Sciences
JF - Solid State Sciences
IS - 7
ER -