Co3(2-OOCC6H4PO3)2(H2O)3·H2O: A layered metal phosphonate showing reversible dehydration–rehydration behavior and ferrimagnetism

Abstract

Two isostructural metal phosphonates M₃(2-cpp)₂(H₂O)₃·H₂O [M(II) = Co (1), Zn (2), 2-cppH₃ = 2-carboxyphenylphosphonic acid] are synthesized and structurally characterized. Both exhibit layer structures in which -Co-O- "columns" are connected by the {PO₃C} linkages. The "column" consists of triangular shaped {M₃O₃} trimers, inter-linked through either corner- or edge-sharing of the {MO₆} octahedra. The phenyl groups are grafted on the two sides of the inorganic layer. Thermal analyses suggest that the layer structures of 1 and 2 are stable after removal of the lattice and coordination water. The dehydrated sample can be rehydrated reversibly in the case of compound 1. Magnetic studies reveal that antiferromagnetic interactions dominate in both 1 and 1-de, resulting in ferrimagnetic layers in both cases. The large inter-layer distance in 1 favors a ferromagnetic interaction between the layers. Hence ferrimagnetism is observed in both cases at low temperature. For 1-de, slow magnetization relaxation is also observed below ca. 2.8 K.

Breathing Effect in a Cobalt Phosphonate upon Dehydration/Rehydration: A Single‐Crystal‐to‐Single‐Crystal Study

“…The 5-phosphonatophenyl-1,2,4-tricarboxylic acid ligand (pbtcH 5 ) was synthesized by following a similar procedure reported in the literature. [24] A mixture of CoCl 2 ·6 H 2 O (0.15 mmol, 0.0248 g), pbtcH 5 (0.05 mmol, 0.0145 g), 2,2'-bpy (0.15 mmol, 0.0234 g), and H 2 O (4 mL), adjusted to pH % 2.7 with 0.1 m piperazidine, was placed in a Teflon-lined stainless steel vessel and heated at 140 8C for 24 h. After the reaction system was cooled to RT, mauve block-like crystals were collected as a single phase Figure 6. Thermal behavior of c M T for 2 between 2 and 300 K. Inset: Experimental c M T values for the same sample between 2 and 30 K. The solid line represents the best fit with the parameters given in the text.…”

Integrative strategies to hybrid lamellar compounds: an integration challenge

“…Figure 1 -Simplified representations of several layered inorganic compounds: a) a calcium montmorillonite (Viani et al, 2002); b) shigaite [AlMn (OH) ] (SO ) Na(H 2 O) 6 .6H 2 O, a layered double hydroxide (Cooper and Hawthorne, 1996); c) tobermorite, a calcium silicate hydrate (Mrlino et al, 1999); d) vanadium pentoxide layered structure (Filonenko et al, 2004); e) schematic representation of Co 3 ( 2-OOCC 6 H PO 3 ) 2 (H 2 O) 3 •H 2 O layered metal phosphonate featuring a 2-carboxyphenylphosphonic acid as organic building block, viewed along the b axis (Wang et al, 2011); f) a layered zinc phosphate (Choudhury et al, 2002) g) a layered iron hexathiohypodiphosphate, MPS 3 (Clement et al, 1986) and h) Bi 2 MnTe 4 chalcogenide displaying mixed interlayer space (Lee et al, 2013).…”

Cobalt and copper pyridylmethylphosphonates with two- and three-dimensional structures and field-induced magnetic transitions

“…1,2 The great interest in this area is driven not only by their aesthetically beautiful architectures and topologies 3,4 but also by their potential applications in sorption, [5][6][7] catalysis, [8][9][10][11] proton conductivity, [12][13][14][15][16] optics [17][18][19] and magnetism. In the study of molecule-based magnetic materials, metal phosphonates could provide good examples for understanding some interesting magnetic phenomena, for example, single molecule magnets, [20][21][22][23][24][25][26][27][28][29][30] single chain magnets, [31][32][33][34][35] ferrimagnetism, [36][37][38][39][40] weak ferromagnetism, [41][42][43][44][45][46][47][48]…”