Tailoring Phospholes for Imprint of Fluorescent 3D Structures
PMMA based polymer blends have been infused with luminescent phospholes and have been structured via nanoimprint. While symmetrically substituted phospholes are prone to crystallization and phase separation, structural modification of the phosphole backbone in the α- and β-positions has been explored, which prevents these issues; a structural explanation for this is suggested. Best phase integrity has been obtained for β-silyl-substituted phospholes, which were implemented in thin films and beads. The emission wavelengths of the phospholes are shifted bathochromically in the polymer matrix as compared to the neat compounds featuring emission bands near 500 nm. This enables tracking of the fluorescent beads using standard fluorescence microscopy.
Roesler, Fabian,Kaban, Burhan,Klintuch, Dieter,Ha, Uh-Myong,Bruhn, Clemens,Hillmer, Hartmut,Pietschnig, Rudolf
ZUR REAKTION VON PHOSPHORVERBINDUNGEN MIT SCHWESINGER BASEN-I P-C-BINDUNGKNUEPFUNG AN P-H-FUNKTIONELLEN PHOSPHORVERBINDUNGEN
Secondary and tertiary phosphines (RR'PH; R2R'P) may be synthesized by alkylation of primary or secondary phosphines with organo halides (R' = Et, n-C7H15, Bz, Me3Si; X = Cl, Br) in the presence of Schwesinger bases as auxillary bases in high yields.Alkylation of diphenylphosphine with alkylene dihalides and Schwesinger bases affords alkylendiphosphines. Key words: Alkylation; secondary and tertiary phosphines; Schwesinger bases.
A nuclear magnetic resonance investigation of the bonding in fourth-group phenylphosphines
The compounds (CH3)3MPHC6H5 where M = C, Si, and Sn have been synthesized, and J(31P-1H) values recorded. Infrared assignments in the region 4000-400 cm-1 are also presented. Controlled oxidation of the tin compound yields (CH3)3-SnOPHC6H5 as established by 31P couplings which also give information concerning the exchange of groups at phosphorus in mixtures of the two tin compounds. The one-bond 31P-1H couplings have been interpreted in terms of a pyramidal arrangement of bonds at phosphorus.
Harrison,Ulrich,Zuckerman
p. 25 - 28
(2007/10/05)
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