Molecular Metal Phosphonates

Phosphonated Podand Type Ligand for the Complexation of Lanthanide CationsPhosphonated Podand Type Ligand for the Complexation of Lanthanide Cations

“…Finally, for one of the phosphonate functions, one O atom is linked to the Eu atom and is bridging a central Na cation, and a second oxygen atom of this function is coordinated to the Eu atom of the second complex. For these phosphonate functions, a height membered Eu(OPO) 2 Eu metallacycle is formed, as often observed in dimeric Ln phosphonate complexes , …”

“…For these phosphonate functions, a height membered Eu(OPO) 2 Eu metallacycle is formed, as often observed in dimeric Ln phosphonate complexes. [22,23] The Eu cations are nine coordinated by the central N atom, the three N atoms of the pyridyl rings, three O atoms of the three phosphonate functions, an O atom of a phosphonate function from the neighbouring EuL complex, and a water molecule. It is worth noting that the analogue ligand bearing three carboxylic acid functions in place of the phosphonic ones in our ligand has been extensively studied, [24] and the X-ray crystal structure of the Eu complex also displayed a coordination num- Looking at the coordination sphere around the Eu atoms (Figure 7), two pyridyl rings are placed at opposite positions, while the third one forms an angle of ca 60°with the average plane formed by the two first ones.…”

2,6-(Diphenylmethyl)-Aryl-Substituted Neutral and Anionic Phosphates: Approaches to H-Bonded Dimeric Molecular Structures

“…In the case of silicon hydroxides there is significant variation of solid state structures as the substituents, and the number of hydroxide groups are varied –. Among these, organophosphonic acids and phosphinic acids have been investigated in terms of their ability to afford metallaphosphonates of diverse structures and nuclearities . In comparison, the chemistry of the analogous phosphates, ROP(O)(OH) 2 , can be envisioned to be even more interesting considering that phosphorus is attached to four electronegative oxygen atoms rendering the acidity of the P‐OH units in these compounds higher and consequently more reactive.…”

“…[2c-e] Among these, organophosphonic acids and phosphinic acids have been investigated in terms of their ability to afford metallaphosphonates of diverse structures and nuclearities. [11] In comparison, the chemistry of the analogous phosphates, ROP(O)(OH) 2 , can be envisioned to be even more interesting considering that phosphorus is attached to four electronegative oxygen atoms rendering the acidity of the P-OH units in these compounds higher and consequently more reactive. Further, in contrast to organophosphonic/phosphinic acids which contain PÀC bonds and a relatively rigid motif, compounds such as ROP(O)(OH) 2 should be more adaptable to the requirements of the reacting moieties since the R group in these compounds is attached to the phosphorus centre only indirectly via the oxygen atom which acts as a flexible hinge.…”

Synthesis, Structure, and Magnetic Properties of Phosphinate‐Bridged Hexanuclear FeIII Complexes Containing Two Butterfly‐Shaped Fe3O Cores

“…Organophosphonates, [RPO 3 ] 2– , derived from the corresponding phosphonic acids, [RP(O)(OH) 2 ], are being increasingly used in the preparation of polynuclear metal complexes involving main‐group,1,2 transition‐metal,1a,3–5 and lanthanide‐metal ions 1a,6. Although the multidentate nature of this ligand often generates compounds possessing extended structures,7 it is possible to prepare discrete molecular derivatives by suitable choice of reaction conditions, including the use of sterically hindered substituents on phosphorus and/or suitable ancillary ligands 1a,8. In contrast to [RPO 3 ] 2– , organophosphinates, [R 2 PO 2 ] – , derived from [R 2 P(O)(OH)] [isostructural with aliphatic or aromatic carboxylates (Figure 1)] have not received as much attention with transition‐metal ions although their reactions with main‐group metal oxides, oxide–hydroxides, and hydroxides are known 9,10.…”