Layered Mixed-Metal Phenylphosphonates, MnxCo1−x(O3PC6H5)·H2O: Structure and Magnetic Properties

M(H2O)(PO3C10H6OH)·(H2O)0.5 (M = Co, Mn, Zn, Cu): a new series of layered metallophosphonate compounds obtained from 6-hydroxy-2-naphthylphosphonic acid

“…Such behavior is identical to the one previously described for Co(O 3 PC 6 H 5 )·H 2 O. 61,66 The fit of the 1/χ = f (T ) curve in the high temperature region (above 150 K) leads to a Curie constant of 3.87 emu K mol −1 , which is in agreement with the expected value for HS Co(II) ions in octahedral sites 67 and a negative Weiss temperature of −60 K. The 2D magnetic behavior is fitted in the high temperature region (T > 40 K) using the high temperature series expansion for a square planar layer of Ising spins S = 1/2. 68 The fit leads to J = −6.9 cm −1 .…”

“…This overall behavior can be ascribed to a canted antiferromagnetic ordering below 12.2 K as has been previously described for other Mn phosphonate layered compounds. 38,61,[63][64][65] The M vs. H curve ( Fig. 9) does not show opening of a hysteresis, as expected for canted antiferromagnets with a very small canting angle.…”

“…62 The fit leads to J = −1.9 cm −1 (considering a Hamiltonian in the form H ¼ ÀJ P ij S i Á S j ), in the same range as the exchange interactions reported for similar systems. 61 When the temperature decreases further, χ = f (T ) shows a sharp increase at 12 K, and the zfc and fc curves start diverging (Fig. 8a).…”

“…At low temperatures, χ = f (T ) presents a broad hump centered at 20 K, corresponding to 2D antiferromagnetic short range interactions. 38,61 The χ = f (T ) curve was fitted with a 2D high temperature series expansion for a square planar layer of Heisenberg spins S = 5/2 for T above 15 K (below this temperature, 3D correlations invalidate the model). 62 The fit leads to J = −1.9 cm −1 (considering a Hamiltonian in the form H ¼ ÀJ P ij S i Á S j ), in the same range as the exchange interactions reported for similar systems.…”

Evidences for Chelating Complexes of Lithium with Phenylphosphinic and Phenylphosphonic Acids: A Spectroscopic and DFT Study

“…Several transition metal phenylphosphonates were prepared. 1,[8][9][10][11][12] Burkovskaya et al 7 reported the X-ray structure of decanuclear phenylphosphonate bridged Co(II) complexes. Furthermore, Wang et al 8 reported a single chain cobalt phenylphosphonate complex [Co(phen)(4,4 -bpy)(C 6 H 5 PO 3 H) 2 ] n 0.5 H 2 O (phen=1,10-phenanthroline, 4,4 -bpy=4,4 -bipyridine).…”