TY - JOUR
T1 - Diverse structures and magnetism of cobalt(II) and manganese(II) compounds with mixed azido and carboxylato bridges induced by methylpyridinium carboxylates
AU - Jia, Qin Xiang
AU - Tian, Hua
AU - Zhang, Jian Yong
AU - Gao, En Qing
PY - 2011/1/17
Y1 - 2011/1/17
N2 - Herein we present a systematic study of the structures and magnetic properties of six coordination compounds with mixed azide and zwitterionic carboxylate ligands, [M(N3)2(2-mpc)] (2-mpc=N- methylpyridinium-2-carboxylate; M=Co for 1 and Mn for 2), [M(N3) 2(4-mpc)] (4-mpc=N-methylpyridinium-4-carboxylate; M=Co for 3 and Mn for 4), [Co3(N3)6(3-mpc)2(CH 3OH)2] (5), and [Mn3(N3) 6(3-mpc)2] (6; 3-mpc=N-methylpyridinium-3-carboxylate). Compounds 1-3 consist of one-dimensional uniform chains with (n'-EO-N 3)2(Î-COO) triple bridges (EO=end-on); 5 is also a chain compound but with alternating [(n'-EO-N3)2(n'-COO)] triple and [(EO-N3)2] double bridges; Compound 4 contains two-dimensional layers with alternating [(n'-EO-N3) 2(n'-COO)] triple, [(n'-EO-N3)(n'-COO)] double, and (EE-N3) single bridges (EE=end-to-end); 6 is a layer compound in which chains similar to those in 5 are cross-linked by a n'3-1,1,3- N3 azido group. Magnetically, the three CoII compounds (1, 3, and 5) all exhibit intrachain ferromagnetic interactions but show distinct bulk properties: 1 displays relaxation dynamics at very low temperature, 3 is an antiferromagnet with field-induced metamagnetism due to weak antiferromagnetic interchain interactions, and 5 behaves as a noninnocent single-chain magnet influenced by weak antiferromagnetic interchain interactions. The magnetic differences can be related to the interchain interactions through π-π stacking influenced by different substitution positions in the ligands and/or different magnitudes of intrachain coupling. All of the MnII compounds show overall intrachain/intralayer antiferromagnetic interactions. Compound 2 shows the usual one-dimensional antiferromagnetism, whereas 4 and 6 exhibit different weak ferromagnetism due to spin canting below 13.8 and 4.6K, respectively.
AB - Herein we present a systematic study of the structures and magnetic properties of six coordination compounds with mixed azide and zwitterionic carboxylate ligands, [M(N3)2(2-mpc)] (2-mpc=N- methylpyridinium-2-carboxylate; M=Co for 1 and Mn for 2), [M(N3) 2(4-mpc)] (4-mpc=N-methylpyridinium-4-carboxylate; M=Co for 3 and Mn for 4), [Co3(N3)6(3-mpc)2(CH 3OH)2] (5), and [Mn3(N3) 6(3-mpc)2] (6; 3-mpc=N-methylpyridinium-3-carboxylate). Compounds 1-3 consist of one-dimensional uniform chains with (n'-EO-N 3)2(Î-COO) triple bridges (EO=end-on); 5 is also a chain compound but with alternating [(n'-EO-N3)2(n'-COO)] triple and [(EO-N3)2] double bridges; Compound 4 contains two-dimensional layers with alternating [(n'-EO-N3) 2(n'-COO)] triple, [(n'-EO-N3)(n'-COO)] double, and (EE-N3) single bridges (EE=end-to-end); 6 is a layer compound in which chains similar to those in 5 are cross-linked by a n'3-1,1,3- N3 azido group. Magnetically, the three CoII compounds (1, 3, and 5) all exhibit intrachain ferromagnetic interactions but show distinct bulk properties: 1 displays relaxation dynamics at very low temperature, 3 is an antiferromagnet with field-induced metamagnetism due to weak antiferromagnetic interchain interactions, and 5 behaves as a noninnocent single-chain magnet influenced by weak antiferromagnetic interchain interactions. The magnetic differences can be related to the interchain interactions through π-π stacking influenced by different substitution positions in the ligands and/or different magnitudes of intrachain coupling. All of the MnII compounds show overall intrachain/intralayer antiferromagnetic interactions. Compound 2 shows the usual one-dimensional antiferromagnetism, whereas 4 and 6 exhibit different weak ferromagnetism due to spin canting below 13.8 and 4.6K, respectively.
KW - N ligands
KW - carboxylate ligands
KW - cobalt
KW - magnetic properties
KW - manganese
UR - https://www.scopus.com/pages/publications/78651426732
U2 - 10.1002/chem.201001151
DO - 10.1002/chem.201001151
M3 - 文章
AN - SCOPUS:78651426732
SN - 0947-6539
VL - 17
SP - 1040
EP - 1051
JO - Chemistry - A European Journal
JF - Chemistry - A European Journal
IS - 3
ER -