meso-Porphyrinylphosphine Oxides: Mono- and Bidentate Ligands for Supramolecular Chemistry and the Crystal Structures of Monomeric [10,20-Diphenylporphyrinatonickel(II)-5,15-diyl]-bis-[P(O)Ph2] and Polymeric Self-Coordinated ([10,20-Diphenylporphyrinatozinc(II)-5,15-diyl]-bis-[P(O)Ph2])

A series of porphyrins substituted in one or two meso-positions by diphenylphosphine oxide groups has been prepared by the palladium catalysed reaction of diphenylphosphine or its oxide with the corresponding bromoporphyrins. Compounds {MDPP-[P(O)Ph2]n} (M = H2, Ni, Zn; H2DPP = 5,15-diphenylporphyrin; n = 1, 2) were isolated in yields of 60-95%. The reaction is believed to proceed via the conventional oxidative addition, phosphination and reductive elimination steps, as the stoichiometric reaction of η1-palladio(II) porphyrin [PdBr(H2DPP)(dppe)] (H2DPP = 5,15-diphenylporphyrin; dppe = 1,2-bis(diphenylphosphino)ethane) with diphenylphosphine oxide also results in the desired mono-porphyrinylphosphine oxide [H2DPP-P(O)Ph2]. Attempts to isolate the tertiary phosphines failed due to their extreme air-sensitivity. Variable temperature 1H NMR studies of [H2DPP-P(O)Ph2] revealed an intrinsic lack of symmetry, while fluorescence spectroscopy showed that the phosphine oxide group does not behave as a "heavy atom" quencher. The electron withdrawing effect of the phosphine oxide group was confirmed by voltammetry. The ligands were characterised by multinuclear NMR and UV-visible spectroscopy as well as mass spectrometry. Single crystal X-ray crystallography showed that the bis(phosphine oxide) nickel(II) complex {[NiDPP-[P(O)Ph2]2} is monomeric in the solid state, with a ruffled porphyrin core and the two P=O fragments on the same side of the average plane of the molecule. On the other hand, the corresponding zinc(II) complex formed infinite chains through coordination of one Ph2PO substituent to the neighbouring zinc porphyrin through an almost linear P=O---Zn unit, leaving the other Ph2PO group facing into a parallel channel filled with disordered water molecules. These new phosphine oxides are attractive ligands for supramolecular porphyrin chemistry.

Conditions for efficient and stable ion acceleration by moderate circularly polarized laser pulses at intensities of 10(20) W/cm(2)

Conditions for efficient and stable ion radiation pressure acceleration (RPA) from thin foils by circularly polarized laser pulses at moderate intensities are theoretically and numerically investigated. It is found that the unavoidable decompression of the co-moving electron layer in Light-Sail RPA leads to a change of the local electrostatic field from a

[3/10/20, démonstration de push-ball au stade Elisabeth, 12e fête athlétique de Fémina-Sports] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 61307

4/10/20, gare de l'Est, départ [de recrues de la] classe 20 [deux amoureux échangent un baiser] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 61336

Parc des Princes, 24/10/20, équipe 3, gagnante du 800 m relais : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 61670

Parc des Princes, 24/10/20, course de 800 m relais, équipe 1 : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 61671

Parc des Princes, 24/10/20, équipe Section Paloise [rugby] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 61678

Parc des Princes, 24/10/20, équipe du Stade [Français, rugby] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 61679

Stade Elysabeth [i. e. Elisabeth], 24/10/20, match de basket-ball, Sportives contre En avant : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 61680

Stade Elysabeth [i. e. Elisabeth], 24/10/20, équipe de basket-ball, Sportives : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 61681

24/10/20, stade Elysabeth [i. e. Elisabeth], équipe [de football féminin, illisible] Reste [de la France] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 61682

24/10/20, stade Elysabeth [i. e. Elisabeth], équipe de France [de football féminin] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 61683

24/10/20, stade Elysabeth [i. e. Elisabeth], équipe de France [de football féminin] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 61684

24/10/20, rue Olivier-de-Serres, [football] association, équipe R.C.F. [Racing Club de France] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 61689

24/10/20, rue Olivier-de-Serres, [football] association, équipe R.C.F. [Racing Club de France] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 61690