TY - JOUR
T1 - Copper(II) coordination polymers containing neutral trinuclear or anionic dinuclear building units based on pyrazole-3,5-dicarboxylate
T2 - synthesis, structures and magnetic properties
AU - Klongdee, Fatima
AU - Boonmak, Jaursup
AU - Moubaraki, Boujemaa
AU - Murray, Keith S
AU - Youngme, Sujittra
PY - 2017/4/18
Y1 - 2017/4/18
N2 - Four novel copper(II) coordination polymers, namely {[Cu3(pzdc)2(pyz)(H2O)6](H2O)}n (1), {[Cu3(pzdc)2(bpy)(H2O)8](H2O)6}n (2), {[Cu4(Hpzdc)2(pzdc)2(bpy)2][Cu(bpy)(H2O)4]n(H2O)4}n (3), and {[Cu3(pzdc)2(ampy)(H2O)5](H2O)3}n (4) (H3pzdc = pyrazole-3,5-dicarboxylic acid, pyz = pyrazine, bpy = 4,4′-bipyridine and ampy = 2-aminopyrazine) were synthesized and characterized. Compounds 1, 2 and 4 were synthesized by layering method at room temperature while 3 was prepared under solvothermal reaction. Compounds 1 and 2 are one-dimensional (1D) chain coordination polymers, while 3 shows 1D cationic chain coordination polymer with anionic tetranuclear Cu(II) cluster. Compound 4 exhibits 1D ladder-like chain structure. Compounds 1, 2 and 4 consist of neutral trinuclear [Cu3(pzdc)2] building unit which is constructed by μ2-pzdc3− bridging (5-6-5), (6-6-6), and (6-5-5) sequences of Cu(II) geometries for 1, 2 and 4, respectively. Each trinuclear unit is extended via N,N′-linkers giving polymeric chain structure. In contrast, anionic tetranuclear cluster of 3 is built up from two anionic dinuclear metallacyclic [Cu2(Hpzdc)(pzdc)]− building units and double μ2-bpy spacers. The magnetic properties of 1, 2 and 4 exhibit weak antiferromagnetic interactions among Cu(II) centers.
AB - Four novel copper(II) coordination polymers, namely {[Cu3(pzdc)2(pyz)(H2O)6](H2O)}n (1), {[Cu3(pzdc)2(bpy)(H2O)8](H2O)6}n (2), {[Cu4(Hpzdc)2(pzdc)2(bpy)2][Cu(bpy)(H2O)4]n(H2O)4}n (3), and {[Cu3(pzdc)2(ampy)(H2O)5](H2O)3}n (4) (H3pzdc = pyrazole-3,5-dicarboxylic acid, pyz = pyrazine, bpy = 4,4′-bipyridine and ampy = 2-aminopyrazine) were synthesized and characterized. Compounds 1, 2 and 4 were synthesized by layering method at room temperature while 3 was prepared under solvothermal reaction. Compounds 1 and 2 are one-dimensional (1D) chain coordination polymers, while 3 shows 1D cationic chain coordination polymer with anionic tetranuclear Cu(II) cluster. Compound 4 exhibits 1D ladder-like chain structure. Compounds 1, 2 and 4 consist of neutral trinuclear [Cu3(pzdc)2] building unit which is constructed by μ2-pzdc3− bridging (5-6-5), (6-6-6), and (6-5-5) sequences of Cu(II) geometries for 1, 2 and 4, respectively. Each trinuclear unit is extended via N,N′-linkers giving polymeric chain structure. In contrast, anionic tetranuclear cluster of 3 is built up from two anionic dinuclear metallacyclic [Cu2(Hpzdc)(pzdc)]− building units and double μ2-bpy spacers. The magnetic properties of 1, 2 and 4 exhibit weak antiferromagnetic interactions among Cu(II) centers.
KW - Coordination polymer
KW - Copper(II)
KW - Magnetic properties
KW - Pyrazole-3,5-dicarboxylic acid
KW - Secondary building unit
UR - http://www.scopus.com/inward/record.url?scp=85012267023&partnerID=8YFLogxK
U2 - 10.1016/j.poly.2017.01.015
DO - 10.1016/j.poly.2017.01.015
M3 - Article
AN - SCOPUS:85012267023
SN - 0277-5387
VL - 126
SP - 8
EP - 16
JO - Polyhedron
JF - Polyhedron
ER -