Abstract
Thermal reactions of cobalt(II) salts with flexible N,N′-bis(pyrid-3-ylmethyl)adipoamide (L) and angular 4,4′-sulfonyldibenzoic acid (H2SDA) in H2O and CH3OH afforded a pair of supramolecular isomers: [Co2(L)(SDA)2], 1, and [Co2(L)(SDA)2]⋅CH3OH⋅H2O, 2. The structure of complex 1 can be simplified as a one-dimensional (1D) looped chain with L ligands penetrating into the middles of squares, forming a new type of self-catenated net with the (42⋅54)(4)2(5)2 topology, whereas complex 2 displays a 2-fold interpenetrated 2D net with the rare (42⋅68⋅8⋅104)(4)2-2,6L1 topology. While both complexes 1 and 2 display antiferromagnetism with strong spin-orbital coupling, the antiferromagnetism of 2 is accompanied by a cross-over behavior and probably a spin canting phenomenon.
Highlights
The preparation and structural characterization of coordination polymers (CPs) with manipulable networks by judicial design continue to be an important point of contest in the research fields of crystal engineering, presumably due to their fascinating structural types and various potential applications in gas storage, catalysis, ion exchange, photoluminescence and magnetism [1,2,3,4,5]
The structures of CPs based on flexible bis-pyridyl-bis-amide ligands are less foreseeable, most probably due to the supramolecular
The N,N0 -bis(pyrid-3-ylmethyl)adipoamide (L) ligands were reacted with formation of entangled CPs [13]
Summary
The preparation and structural characterization of coordination polymers (CPs) with manipulable networks by judicial design continue to be an important point of contest in the research fields of crystal engineering, presumably due to their fascinating structural types and various potential applications in gas storage, catalysis, ion exchange, photoluminescence and magnetism [1,2,3,4,5]. The supramolecular isomers of CPs are those that show identical chemical compositions but differ in the structural types of the core structures. A few supramolecular isomers based on both dicarboxylate and bis-pyridyl ligands have been reported [8], it remains a challenge to elucidate the structure–ligand relationship and thereby the intrinsic properties. The structures of CPs based on flexible bis-pyridyl-bis-amide (bpba) ligands are less foreseeable, most probably due to the supramolecular [13]. To explore the angular dicarboxylate ligands on the of flexible bpbaII CPs and to elucidate their structure–ligand relationship, as well as to inspect bpba-based. Coand based CoII CPs to elucidate their structure–ligand relationship, as well as to inspect the geometric the geometric on their magneticwe properties, we have investigated.
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