TY - JOUR
T1 - Three azido-bridged Mn(II) complexes based on open-chain Diazine Schiff-base ligands
T2 - Crystal structures and magnetic properties
AU - Yue, Yan Feng
AU - Gao, En Qing
AU - Fang, Chen Jie
AU - Zheng, Tao
AU - Liang, Jue
AU - Yan, Chun Hua
PY - 2008/9
Y1 - 2008/9
N2 - Three new Mn(II)-azido polymeric complexes [MnL1(N 3)2·CH3OH]n (1) (L 1 = 1-(2-pyridyl)-1-amino-4-(6-bromo-2-pyridyl)-2,3-diaza-1,3- butadiene), [MnL2(N3)2]n (2a) and [Mn2(L2)2(N3)4] n (2b) (L2 = 1-(2-pyridyl)-1-amino-4-benzyl-2,3-diaza-1,3- butadiene) have been synthesized and crystallographically characterized, and their magnetic properties are studied. Complexes 1 and 2b show similar one-dimensional (1D) coordination polymeric structure, in which Mn(II) ions are alternately bridged by two end-to-end (EE) and two end-on (EO) azido ligands, resulting in zigzag Mn(II)-azido chains. Complex 2a has a 1D structure, and the Mn(II) ions are connected by double EO azido ligands, forming a neutral 1D uniform chain. Standing in their mother liquor for ca. 2 weeks or more, 2a is transformed to 2b completely. The structures of 2a and 2b are characterized, and the quite different magnetic properties based on this transformation of kinetic favored phase to thermodynamic favored phase are discussed. Magnetic analyses reveal that alternating ferro- and antiferromagnetic interactions are mediated through the alternating EO and EE azido bridges, and the JF and JAF parameters are 7.8(1) and -10.8(1) for complex 1, respectively, 7.7(4) and -11.2(1) cm-1 for complex 2b, respectively. For 2a, on the contrary, magnetic analyses reveal that the ferromagnetic coupling interactions are mediated through the double EO azido bridges, and the JF is 1.4 cm-1.
AB - Three new Mn(II)-azido polymeric complexes [MnL1(N 3)2·CH3OH]n (1) (L 1 = 1-(2-pyridyl)-1-amino-4-(6-bromo-2-pyridyl)-2,3-diaza-1,3- butadiene), [MnL2(N3)2]n (2a) and [Mn2(L2)2(N3)4] n (2b) (L2 = 1-(2-pyridyl)-1-amino-4-benzyl-2,3-diaza-1,3- butadiene) have been synthesized and crystallographically characterized, and their magnetic properties are studied. Complexes 1 and 2b show similar one-dimensional (1D) coordination polymeric structure, in which Mn(II) ions are alternately bridged by two end-to-end (EE) and two end-on (EO) azido ligands, resulting in zigzag Mn(II)-azido chains. Complex 2a has a 1D structure, and the Mn(II) ions are connected by double EO azido ligands, forming a neutral 1D uniform chain. Standing in their mother liquor for ca. 2 weeks or more, 2a is transformed to 2b completely. The structures of 2a and 2b are characterized, and the quite different magnetic properties based on this transformation of kinetic favored phase to thermodynamic favored phase are discussed. Magnetic analyses reveal that alternating ferro- and antiferromagnetic interactions are mediated through the alternating EO and EE azido bridges, and the JF and JAF parameters are 7.8(1) and -10.8(1) for complex 1, respectively, 7.7(4) and -11.2(1) cm-1 for complex 2b, respectively. For 2a, on the contrary, magnetic analyses reveal that the ferromagnetic coupling interactions are mediated through the double EO azido bridges, and the JF is 1.4 cm-1.
UR - https://www.scopus.com/pages/publications/61549097206
U2 - 10.1021/cg800138x
DO - 10.1021/cg800138x
M3 - 文章
AN - SCOPUS:61549097206
SN - 1528-7483
VL - 8
SP - 3295
EP - 3301
JO - Crystal Growth and Design
JF - Crystal Growth and Design
IS - 9
ER -