Three-dimensional metal phosphonodicarboxylates with GIS-zeolite topology: syntheses, structures and magnetic studies

Abstract

Compounds [M(2)(4-pi)(H(2)O)(4)]·1.5H(2)O [M(II) = Mn(1), Co(2), Ni(3)] and a heterometallic analogue [Co(1.14)Ni(0.86)(4-pi)(H(2)O)(4)]·1.5H(2)O (4) have been synthesized utilizing a rigid 4-phosphonoisophthalic acid (4-piH(4)). Compounds 1-4 are isostructural, confirmed by their powder XRD measurements. Single crystal structural determinations of 1 and 2 reveal that these compounds display a novel pillared layered open framework structure with zeolite gismondine (GIS) topology. Within the layer, edge-sharing {MO(6)} octahedra are found, which are connected by carboxylate and phosphonate groups along the c- and b-axis, respectively. Dominant antiferromagnetic interactions are propagated between the magnetic centers in 1, 2 and 4. While in 3, ferromagnetic exchange couplings are observed.

New Magnetic Nickel(II)-Thiolate Cluster-Based Coordination Polymer Constructed from 2-Mercaptonicotinic Acid

“…This case has been documented by previous work , and indicates strong antiferromagnetic exchange coupling among the Ni 9 cluster . Upon decreasing the temperature, the χ M T value declines almost linearly to 3.63 cm 3 K mol –1 at 55 K, also indicative of the existence of a dominant antiferromagnetic exchange coupling. , The further decrease in temperature witnesses a slight increase of χ M T value to 3.74 cm 3 K mol –1 at 16 K, which may contribute to the presence of weak intramolecular ferromagnetic interaction , and spin frustration . Below 16 K, the χ M T value declines rapidly to 2.75 cm 3 K mol –1 at 2 K, suggesting the presence of intermolecular antiferromagnetic interactions.…”

Syntheses, Characterization, and Properties of Three-Dimensional Pillared Frameworks with Entanglement

“…The two curves, however, are overlapping in this temperature range (Figure S13, Supporting Information). The measurements of ac magnetic susceptibility reveal that neither in-phase ( χ′ ) nor out-of-phase ( χ′′ ) signals show maximum until 1.8 K (Figure S14, Supporting Information), excluding the occurrence of magnetic ordering above 1.8 K …”

“…The two curves, however, are overlapping in this temperature range (Figure S13, Supporting Information). The measurements of ac magnetic susceptibility reveal that neither in-phase (χ 0 ) nor out-of-phase (χ 00 ) signals show maximum until 1.8 K (Figure S14, Supporting Information), excluding the occurrence of magnetic ordering above 1.8 K. 30 ' CONCLUSIONS Assembly of metal salts with tripodal rigid imidazole-containing ligand 3,5-di(imidazol-1-yl)benzoic acid (HL) as well as carboxylate auxiliary ligands results in the formation of entangled pillared-layer frameworks. The ligand containing neighbored carboxylate groups shows a capability to form the metal clusters in 1 and 2, and the linear carboxylate ligands were proven to be a good candidate for constructing interpenetrating and selfpenetrating architectures.…”

Metal complexes as templates: syntheses, structures, and luminescent properties of two zinc phosphonocarboxylates with ABW-zeolite topology

“…32 There are few examples of zeolitic metal phophonates. [13][14][15][33][34][35] The only know zinc phosphonates with ABW topology Na[Zn (O 3 PC 2 H 4 -CO 2 )]•H 2 O, whose channels consist of shorter connectors of -C-C-C-O-. 34 Compared with ABW-type zinc phosphonates, metal phosphates 36 and aluminosilicates, 37 2 shows a channel with the ability to accommodate the large guest molecules.…”