Synthesis, Structures and Properties of Cobalt Thiocyanate Coordination Compounds with 4-(hydroxymethyl)pyridine as Co-ligand

Abstract

Abstract:Reaction of Co(NCS) 2 with 4-(hydroxymethyl)pyridine (hmpy) leads to the formation of six new coordination compounds with the composition [Co(NCS) 2 (hmpy) (4) and [Co(NCS) 2 (hmpy) 2 ] n (5). They were characterized by single crystal and powder X-ray diffraction experiments, thermal and elemental analysis, IR and magnetic measurements. Compound 1 and 1-H 2 O form discrete complexes, in which the Co(II) cations are octahedrally coordinated by two terminal thiocyanato anions and four 4-(hydroxymethyl)pyridine ligands. Discrete complexes were also observed for compounds 2 and 3 where two of the hmpy ligands were substituted by solvent, either water (3) or ethanol (2). In contrast, in compounds 4 and 5, the Co(II) cations are linked into chains by bridging 4-(hydroxymethyl)pyridine ligands. The phase purity was checked with X-ray powder diffraction. Thermogravimetric measurements showed that compound 3 transforms into 5 upon heating, whereas the back transformation occurs upon resolvation. Magnetic measurements did not show any magnetic exchange via the hmpy ligand for compound 5.

Synthesis, Crystal Structure, Luminescence and Magnetism of Three Novel Coordination Polymers Based on Flexible Multicarboxylate Zwitterionic Ligand

“…Supplementary Materials: The following are available online at www.mdpi.com/2073-4352/7/1/32/s1, Figure S1: The TGA curves of compounds 1-3, Figure S2: The PXRD experimental and as-simulated patterns of compound 1, Figure S3: The PXRD experimental and as-simulated patterns of compound 2, Figure S4: The PXRD experimental and as-simulated patterns of compound 3, Figure S5: 1 H NMR (400 Hz, DMSO-d6) and 13 C NMR (100 Hz, DMSO-d6) spectra of H 3 CbdcpCl Ligand, Figure S6: The IR spectra of ligand H3CbdcpCl, complex 1, 2 and 3, …”

“…Thus, flexible multicarboxylate zwitterionic ligands can be induced to recognize the intrinsic geometric preferences of specific metal ions and to contribute to the structural and topological diversity of CPs. As well as those structural advantages mentioned above, as organic linkers in CPs, flexible multicarboxylate zwitterionic ligands have many other particular properties, which give their CPs potential application as functional materials in magnetism [11][12][13], optical properties [14][15][16], drug delivery [17,18], gas storage [19] and chemical separation [20,21]. Even though CPs have many values, controlling their frameworks is undoubtedly fundamental for determining the properties and applications of the crystalline materials.…”

Synthesis, Crystal Structures, and Properties of Two Coordination Polymers Built from Imidazolyl and Carboxylate Ligands

“…The structure design methodology and properties of coordination polymers are mainly dependent on the intrinsic organic linkers [9,10], inorganic metal units, as well as the external synthesis conditions such as reaction temperatures, pH of the medium, reaction solvents, and counter anions [11][12][13]. Generally, organic linkers with N and/or O donors have often been utilized as effective building units in the process of coordination polymers [14,15].…”

Synthesis, Crystal Structures, and Photoluminescent Properties of Two Supramolecular Architectures Based on Difunctional Ligands Containing Imidazolyl and Carboxyl Groups

“…The N-heterocyclic bridging ligands include imidazole, triazole, tetrazole, and pyridine or its analogues such as pyridazine, tetrazine, triazine, and pyrazine moieties [9][10][11][12]. In our previous studies, we have elaborately designed the series of novel 4-imidazole ligands with flexible coordination modes, and successfully employed the ligands to construct porous frameworks based on the 4-imidazolate-metal building units [13][14][15], and the porous frameworks exhibit favorable gas adsorption properties.…”