Jean-Michel Rueff

m-phosphonobenzoic acid and copper(II) as precursors of helical chain and lamellar hybrid materials

A 1D helical-chain material Cu6(H2O)7(m-PO3C6H4CO2)41, characterized by a non-centrosymmetric crystal structure, and a 2D lamellar hybrid material Cu(H2O)(m-PO3C6H4CO2H) 2 have been synthesised starting from m-phosphonobenzoic acid and copper(II). The pH of the reaction media regulates the formation of either 1 or 2.

Silver-Phosphonate Based Metal Organic Frameworks: Synthesis and Antibacterial Action

Silver based Metal Organic Framework (MOF) materials were synthesized by the reaction of phospho-benzoic acid with silver salts under hydrothermal treatment and with/without urea. According to this procedure, either both functional groups (phosphonic acid and carboxylic acid) were engaged in iono-covalent bonds with silver atoms or, on the contrary, only the phosphonic acid function is engaged. Consequently, these materials exhibited different stability and their ability to release silver salts, when they were placed in water, was different. The antibacterial properties of these materials were attributed to the silver salt, released in solution. GRAPHICAL ABSTRACT

Incipient spin-dipole coupling in a 1D helical-chain metal-organic hybrid

Low dimensional magnetic systems (such as spin-chains) are extensively studied due to their exotic magnetic properties. Here, we would like to address that such systems should also be interesting in the field of dielectric, ferroelectricity and magnetodielectric coupling. As a prototype example, we have investigated a one-dimensional (1D) helical-chain metal–organic hybrid system with a chiral structure which shows a broad hump in magnetic susceptibility at around 55 K (Tmax). The complex dielectric constant exactly traces this feature, which suggests intrinsic magnetodielectric coupling in this chiral system. The dipolar ordering at Tmax occurs due to lattice-distortion which helps to minimize the magnetic energy accompanied by 1D-magnetic ordering or vice versa. This experimental demonstration initiates a step to design and investigate hybrid organic–inorganic magnetic systems consisting of a chiral structure towards ferroelectricity and magnetodielectric coupling.

Rigid Aryl-Phosphonic Acids: Building Blocks for Hybrid Materials

Abstract Rigid organic building blocks possessing both phosphonic acid and carboxylic acid functional groups have been used to produce original metal organic frameworks materials.