TY - JOUR
T1 - Syntheses, crystal structures, and magnetic properties of metal-organic hybrid materials of Co(II) using flexible and rigid nitrogen-based ditopic ligands as spacers
AU - Ahmad, Musheer
AU - Sharma, Manish K.
AU - Das, Raja
AU - Poddar, Pankaj
AU - Bharadwaj, Parimal K.
PY - 2012/3/7
Y1 - 2012/3/7
N2 - A carboxylate-based flexible ligand, 5-(4-carboxybenzyloxy)isophthalic acid (p-cbiaH 3), readily reacts with Co(II) salts in the presence of different pyridine-based coligands such as 4-bis(4-pyridinylmethyl)piperazine (bpmp) or 1,2-di(4-pyridyl)ethylene (dpe) under hydrothermal conditions to afford two different three-dimensional (3D) coordination polymers, {[Co 4(OH) 2(p-cbia) 2(bpmp)-(H 2O) 3]•2H 2O} n (1) and {[Co 4(OH) 2(p-cbia) 2(dpe)(H 2O) 4]•2H 2O} n (2). Both compounds have been characterized by X-ray crystallography, IR spectroscopy, thermogravimetry, and elemental analysis. Single-crystal X-ray diffraction studies reveal that both compounds consist of a tetranuclear core [Co 4(μ 3-OH) 2] 6+. Compound 1 is a unprecedented 3D non-interpenetrated (3,4,9)-connected pkb3 net. On the other hand, compound 2 is a 2-fold interpenetrated (3,8)-connected tfz-d net. Variable temperature static and dynamic magnetic measurements show that both compounds exhibit ferromagnetic behavior associated with mixed hydroxyl/carboxylate-bridged tetranuclear Co(II) clusters as subunits.
AB - A carboxylate-based flexible ligand, 5-(4-carboxybenzyloxy)isophthalic acid (p-cbiaH 3), readily reacts with Co(II) salts in the presence of different pyridine-based coligands such as 4-bis(4-pyridinylmethyl)piperazine (bpmp) or 1,2-di(4-pyridyl)ethylene (dpe) under hydrothermal conditions to afford two different three-dimensional (3D) coordination polymers, {[Co 4(OH) 2(p-cbia) 2(bpmp)-(H 2O) 3]•2H 2O} n (1) and {[Co 4(OH) 2(p-cbia) 2(dpe)(H 2O) 4]•2H 2O} n (2). Both compounds have been characterized by X-ray crystallography, IR spectroscopy, thermogravimetry, and elemental analysis. Single-crystal X-ray diffraction studies reveal that both compounds consist of a tetranuclear core [Co 4(μ 3-OH) 2] 6+. Compound 1 is a unprecedented 3D non-interpenetrated (3,4,9)-connected pkb3 net. On the other hand, compound 2 is a 2-fold interpenetrated (3,8)-connected tfz-d net. Variable temperature static and dynamic magnetic measurements show that both compounds exhibit ferromagnetic behavior associated with mixed hydroxyl/carboxylate-bridged tetranuclear Co(II) clusters as subunits.
UR - http://www.scopus.com/inward/record.url?scp=84857941076&partnerID=8YFLogxK
U2 - 10.1021/cg201619x
DO - 10.1021/cg201619x
M3 - Article
AN - SCOPUS:84857941076
VL - 12
SP - 1571
EP - 1578
JO - Crystal Growth and Design
JF - Crystal Growth and Design
SN - 1528-7483
IS - 3
ER -