Abstract
A semi-flexible bipyrimidyl ligand, 5,5′-bipyrimidin (bpym), was used for the self-assembly of a transition metal coordination polymer, resulting in the formation of a nickel(II) compound, [Ni(Br)2(bpym)2]n (1) with a three-dimemsional (3D) structure. Single-crystal X-ray analysis showed that compound 1 crystallizes in the monoclinic space group C2/c and the structure represents a 3D (4,4)-connected bbe topological framework constructed of nickel(II) ions, twisted cis-μ-bpym and planar trans-μ-bpym groups. Magnetic characterization revealed that 1 shows antiferromagnetic coupling between the pyrimidyl-bridged Ni(II) ions along with weak ferromagnetism due to spin canting with a magnetic ordering below Tc = 3.4 K.
Highlights
The design and synthesis of novel multi-dimensional metal-organic frameworks (MOFs) and/or coordination polymers (CPs), which could be function as molecule-based magnets, has attracted considerable attention in recent years due to their fascinating and diverse structures and topologies that could play a role in a variety of magnetic interactions and resulting bulk magnetic behavior [1,2,3,4,5,6,7,8]
The majority of synthetic strategies for preparing such magnetic CPs involve the use of paramagnetic ions as building blocks and bonding them in close proximity to one another via short bridging ligands, a configuration that would allow for significant magnetic exchange
The nature of the paramagnetic ions means the bulk magnetic behavior of the magnetic CPs depend on several additional factors, including the magnitude and nature of the magnetic interaction transmitted by the bridging ligands, the structure of the extended network, and cooperative interactions between spin carriers
Summary
The design and synthesis of novel multi-dimensional metal-organic frameworks (MOFs) and/or coordination polymers (CPs), which could be function as molecule-based magnets, has attracted considerable attention in recent years due to their fascinating and diverse structures and topologies that could play a role in a variety of magnetic interactions and resulting bulk magnetic behavior [1,2,3,4,5,6,7,8].The majority of synthetic strategies for preparing such magnetic CPs involve the use of paramagnetic ions as building blocks and bonding them in close proximity to one another via short bridging ligands, a configuration that would allow for significant magnetic exchange. The nature of the paramagnetic ions means the bulk magnetic behavior of the magnetic CPs depend on several additional factors, including the magnitude and nature of the magnetic interaction transmitted by the bridging ligands, the structure of the extended network, and cooperative interactions between spin carriers. Regarding bridging ligands for magnetic CPs, six-membered heterocyclic diazines, such as pyridazine, pyrazine, pyrimidine and derivatives thereof have been subjects of considerable interest because they strongly donate σ-electrons to metal centers and the fact that they can exist in various coordination modes, which allow the formation of numerous CPs with diverse extended structures and topologies that exhibit different bulk magnetic properties such as spin-canted antiferromagnetism, ferromagnetism, metamagnetism, ferrimagnetism [9,10,11,12,13,14,15,16]. A 2,20 -bipyrimidine unit, when fused with two 2-Br-substituted pyrimidines, has been used as a bridging ligand for producing numerous magnetic CPs with various structural topologies and magnetic properties, in which the pyrimidyl groups connect multiple metal centers to one another, leading to extended architectures and mediate significant magnetic interactions, conferring unusual bulk magnetic
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