A new series of magnetic and luminescent layered hybrid materials obtained from thianthrene phosphonic acid: M(HO)PO-SCH (M = Cu, Zn) and M(HO)(POOH-SCH) (M = Mn, Co).

Four new metallophosphonates with the chemical formulae M(HO)PO-SCH (M = Cu, Zn) and M(HO)(POOH-SCH) (M = Mn, Co) were synthesized using a hydrothermal route from the original bent rigid thianthrene-2-ylphosphonic acid (TPA). This organic precursor crystallizes in a non-centrosymmetric space group 222 and presents a unique bent geometry due to the presence of two sulfur atoms in its rigid platform architecture. Obtained as single crystal and polycrystalline powders, the structures of the four hybrid materials were solved using X-ray diffraction on single crystals in a monoclinic 2/ space group.

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

Four new metallophosphonates M(HO)(POCHOH)·(HO) (M = Mn, Co, Cu, Zn) were obtained as single crystal and polycrystalline powders by hydrothermal synthesis from the precursors 6-hydroxy-2-naphthylphosphonic acid and the corresponding metal salts. These analogous hybrids crystalized in the space group P12/c1 in a lamellar structure. Their layered structures consisted of inorganic [M(HO)(POC)] layers stacked with organic bilayers of 6-hydroxy-2-naphthyl moieties "HO-CH" and free water molecules.

Tetrahedral chain ordering and low dimensional magnetic lattice in a new brownmillerite SrScFeO.

We report the synthesis, structure and physical properties of a hitherto unreported brownmillerite compound Sr2ScFeO5. We have shown a new ordering sequence of the interlayer iron tetrahedral chains. Reduced dimensionality of the magnetic lattice and the frustration in the two dimensional iron tetrahedral chains originate complex magnetic and magneto-dielectric effects.

Low Dimensional Magnetic Lattice and Room Temperature Magneto(di)electric Effect in Polyanion Ruddlesden-Popper Iron Oxides.

We have shown a new design strategy which exploits different oxyanions in a Ruddlesden-Popper (RP)-type phase to modulate the local crystal structure and magnetic lattice. Material (SrFe(SO)O) with the larger voluminous oxyanion (SO, S-O distance = 1.49 Å) as separating blocks between magnetic FeO layers shows a two-dimensional magnetic lattice.