65878-71-9Relevant academic research and scientific papers
Organometallic oligomers based on bis(arylacetylide)bis(P-chirogenic phosphine)platinum(II) complexes: Synthesis and photonic properties
Lapprand, Antony,Khiri, Na?ma,Fortin, Daniel,Jugé, Sylvain,Harvey, Pierre D.
, p. 2361 - 2371 (2013/04/10)
A series of P-chirogenic oligomers of the type (- C? - /C - aryl - C? - /C - PtL2 -)n [L = (R)- and (S)-P(Ph)(iPr)(C17H35); aryl = 1,4-benzene, 2,1,3-benzothiadiazole] along the corresponding achiral analogues (L = PBu 3) and model complexes PhC? - /CPtL2C? - /CPh were prepared from the ephedrine strategy and were fully characterized [ 1H, 31P NMR; IR; small-angle X-ray scattering (SAXS); gel permeation chromatography (GPC); thermal gravimetric analysis (TGA); circular dichroism, UV-vis, and luminescence spectroscopy; photophysics, and degree of anisotropy measurements]. From the CD measurements, the chiral environment of the phosphine ligands is modestly felt by the aryl moieties. Concurrently, the TGA shows that the P(C17H35)(Ph)(i-Pr)-containing materials are more stable than those containing the shorter chain ligand PBu3, and exhibits red-shifted absorption and emission bands compared to those including the PBu3 ligands. The presence of the long chain on the phosphorus atoms does not greatly alter the photophysical parameters, notably the emission lifetimes, and fast triplet energy transfer terminal* → central unit has been deduced from the absence of luminescence arising from the terminal units.
Visible light-harvesting trans bis(alkylphosphine) platinum(ii)-alkynyl complexes showing long-lived triplet excited states as triplet photosensitizers for triplet-triplet annihilation upconversion
Liu, Lianlian,Huang, Dandan,Draper, Sylvia M.,Yi, Xiuyu,Wu, Wanhua,Zhao, Jianzhang
, p. 10694 - 10706 (2013/09/12)
Symmetric and asymmetric linear trans-bis(tributylphosphine) Pt(ii) bis(acetylide) complexes with functionalized aryl alkynyl ligands (coumarin, naphthalimide and phenyl acetylides) were prepared, which show enhanced absorption in the visible region (mola
Preparation of models and oligomers of metal alkynyls NMR, GPC and X-ray structural characterization of building blocks for the construction of molecular devices
La Groia, Alessandra,Ricci, Antonella,Bassetti, Mauro,Masi, Dante,Bianchini, Claudio,Lo Sterzo, Claudio
, p. 406 - 420 (2007/10/03)
A systematic study has been carried out for the use of the palladium-based Extended One Pot (EOP) synthetic protocol toward the preparation of metal alkynyl oligomers of general formula [- C≡C-Ar-C≡C-M(L)m -]n (M=Pt, Pd). Model compounds of type trans-M(PBu 3)2(C≡CC6H5) 2 have been prepared by the reaction of tributyltinethynylbenzene with trans-M(PBu3)2 Cl2, in the absence of palladium catalysis, since the presence of catalytic Pd(PPh3)4 yields reaction mixtures containing starting material, product and intermediate complex trans-MCl (PBu3)2(C≡CC6H5). Palladium catalysis has been used for the formation of the bistinacetylide compounds Bu3Sn-C≡C- Ar-C≡C-SnBu3 (Ar=C6 H4; bis(2,5-n-octyloxy)C6H4). Subsequent coupling of these compounds with MCl2(PBu3) 2 in the absence of palladium catalyst yields metal alkynyl oligomers. Comparison of 31P-NMR and gel permeation chromatography (GPC) analyses indicates that the GPC technique represents a reliable method to estimate polymer chain lengths for polymers bearing branched aromatic spacers, in spite of the rigid-rod shape of the polymer backbone. Single crystal X-ray determinations of model compounds demonstrate the essential role of side substituents in the aromatic ring to control the supramolecular order and, as a consequence, the optoelectronic properties of materials.
Nuclear Magnetic Resonance (1H-, 13C-, 31P-, 195Pt-NMR)-Studies of Alkynyl Derivatives of Pt(II), Pd(II) and Ni(II)
Sebald, Angelika,Wrackmeyer, Bernd,Beck, Wolfgang
, p. 45 - 56 (2007/10/02)
The NMR parameters (1H, 13C, 31P, 195Pt) of compounds of the type cis- and trans- (M = Ni, Pd, Pt) are reported.The chemical shifts δ13C and δ195Pt (together with UV data) indicate the presence of ?-backbonding from the metal into the ?*CC orbitals.This also explaines some unusual features of the coupling constants J (13C1H), J (13C13C) and J (195Pt13C).The NMR parameters reflect an increase in the amount of ?-backbonding for Pt Pd Ni. - Keywords: Alkynyl Pt(II)-, Pd(II)-, Ni(II)-complexes, Multinuclear NMR
