69303-28-2Relevant academic research and scientific papers
A cyclopendant complexon based on dibenzo-18-crown-6
Bel'skii,Bodrin,Polikarpov,Kabachnik
, p. 1741 - 1743 (1998)
A derivative of dibenzo-18-crown-6 containing dihydroxyphosphorylmethyl groups in the 4, 5, 4′, and 5′ positions of the benzene ring has been synthesized. Unlike dibenzo-18-crown-6, its phosphorylated derivative does not form stable complexes with cations of alkali and alkaline-earth metals. Complexes with transition metals are water-insoluble in most cases.
Tuning Intrinsic and Extrinsic Proton Conduction in Metal-Organic Frameworks by the Lanthanide Contraction
Wong, Norman E.,Ramaswamy, Padmini,Lee, Andrew S.,Gelfand, Benjamin S.,Bladek, Kamila J.,Taylor, Jared M.,Spasyuk, Denis M.,Shimizu, George K.H.
supporting information, p. 14676 - 14683 (2017/10/24)
Seven isomorphous lanthanide metal-organic frameworks in the PCMOF-5 family, [Ln(H5L)(H2O)n](H2O) (L = 1,2,4,5-tetrakis(phosphonomethyl)benzene, Ln = La, Ce, Pr, Nd, Sm, Eu, Gd) have been synthesized and characterized. This family contains 1-D water-filled channels lined with free hydrogen phosphonate groups and gives a very low activation energy pathway for proton transfer. The lanthanide contraction was employed to systematically vary the unit cell dimensions and tune the proton conducting pathways. LeBail fitting of the crystalline series shows that the crystallographic a-axis, along the channel, can be varied in increments less than 0.02 ? correspondingly shortening the proton transfer pathway. The proton conductivities for the La and Pr complexes were roughly an order of magnitude higher than other members of the series (10-3 S cm-1 versus 10-4 S cm-1). Single crystal structures of the high and low conducting members of the series (La, Pr for high and Ce for low) affirm the structural similarities extend beyond the unit cell parameters to positions of free acid groups and included water molecules. Scanning electron microscopy reveals marked differences in particle size of the different members of the Ln series owing to lattice strain effects induced by changing the lanthanide. Notably, the high conducting La and Pr complexes have the largest particle sizes. This result contradicts any notion that degradation of the MOF at grain boundaries is enabling the observed conductivity as proton conduction dominated by extrinsic pathways would be enabled by small particles (i.e., the La and Pr complexes would be the worst conductors). Proton conductivity measurements of a ball milled sample of the La complex corroborate this result.
A water-stable metal-organic framework with highly acidic pores for proton-conducting applications
Taylor, Jared M.,Dawson, Karl W.,Shimizu, George K. H.
supporting information, p. 1193 - 1196 (2013/03/28)
Metal-organic framework (MOF) materials are a nontraditional route to ion conductors, but their crystallinity can give insight into molecular-level transport mechanisms. However, some MOFs can be structurally compromised in humid environments. A new 3D metal-organic framework, PCMOF-5, is reported which conducts protons above 10-3 S/cm at 60 C and 98% relative humidity. The MOF contains free phosphonic acid groups, shows high humidity stability, and resists swelling in the presence of hydration. Channels filled with crystallographically located water and acidic groups are also observed.
Traceurs biomedicaux - Etude physycochimique du Fe3BTMP
Vincens, M.,Mollier, H.,Naini, A.,Toulhoat, C.,Vidal, M.,et al.
, p. 822 - 831 (2007/10/02)
Biomedical tracers - Study of the properties of Fe3BTMP.The complex benzene-1,2,4,5-tetra(methylenephosphonato)triferrate III 4, Fe3BTMP, is a contrast agent for liver MRI (magnetic resonance imaging).The stoichiometries 1:1 and 3:1 were found for FeBTMP 3 and Fe3BTMP 4 using polarography and 31P NMR.At physiological pH and in aqueous solution these complexes are more stable than FeTTMP (5') and as stable as FeN3TMP (6').It was found that 3 and 4 are polymers with linear and polydimensional structures respectively. - - - benzene tetraphosphonic cyclopendents / iron (III) complexes / stability / MRI contrast agents
Organophosphorus osteotropic cyclopodands.
Mollier, H.,Vincens, M.,Vidal, M.,Pasqualini, R.,Duet, M.
, p. 787 - 795 (2007/10/02)
Various phosphorus containing ligands (including phosphonic acids, phosphinic acids and phosphine oxide derivatives) have been synthesized and complexed to technetium.The species derived from benzene-1,2,4,5-tetra(methylenephosphonic) acid (BTMP) and 1,4,8,11-tetraazacyclotetradecane-1,4,8,11-tetra-(methylenephosphonic) acid (TTMP) which are osteotropic vectors have demonstrated excellent tracing properties on animal tests.These tracers however were less effective upon human tests.The differences in their respective biological activities led us to investigate their physicochemical properties in solution. Key Words: organophosphorus cyclopodands / phosphonic acid / technetium / complexes / osteotropic tracers
