Preparation, Characterization, and Photophysical Properties of <i>cis</i>- or <i>trans</i>-PtLn<sub>2</sub> (Ln = Nd, Eu, Yb) Arrays with 5-Ethynyl-2,2′-bipyridine
= Nd 2, Eu 3, Yb 4) or geometrical isomers trans-Pt(PPh3)2(C≡Cbpy)Ln(hfac)3}2 (Ln = Nd 6, Eu 7, Yb 8). As verified through 31P NMR characterization as well as determination of the structures of 1, 4, and 8 by X-ray crystallography, the cis- or trans-arranged forms around PtII centers remain unchanged in both solutions and solid states without thermal or light-induced isomerization during the reactions
Reaction of polymericgold(I) acetylide species (bpyC[triple bond]CAu)n (bpyC[triple bond]CH = 5-ethynyl-2,2'-bipyridine) with diphosphine ligands Ph2P(CH2)nPPh2 (n = 2-6) or 1,1'-bis(diphenylphosphino)-ferrocene (dppf) in dichloromethane induces isolation of binucleargold(I) complexes (bpyC[triple bond]CAu)2mu-Ph2P(CH2)nPPh2} or (bpyC[triple bond]CAu)2(mu-dppf). Complexation of Ln(hfac)3 (hfac =
Heterododecanuclear Pt<sub>6</sub>Ln<sub>6</sub>(Ln = Nd, Yb) arrays of 4-ethynyl-2,2′-bipyridine with sensitized near-IR lanthanide luminescence by Pt → Ln energy transfer
Heterododecanuclear Pt6Ln6 (Ln = Nd, Yb) complexes of 4-ethynyl-2,2â²-bipyridine (HCCbpy), prepared using emissive Pt(Me3SiCCbpy)(CCbpy)2 as an alkynyl bridging âligandâ, afford sensitized near-infrared (NIR) lanthanide luminescence by Pt â Ln energy transfer from both Pt(bpy)(acetylide)2 and Pt2(dppm)2(acetylide)2 chromophores.
Dual Luminescent Dinuclear Gold(I) Complexes of Terpyridyl‐Functionalized Alkyne Ligands and Their Efficient Sensitization of Eu
<sup>III</sup>
and Yb
<sup>III</sup>
Luminescence
quantum yields of Au 2 Ln 2 (Ln = Eu, Yb) solutions show that the energy transfer occurs efficiently from the binuclear gold(I) antennas 1-5 to EuIII and YbIII centers, and all complexes 1-5 are good energy donors for sensitization of visible and NIR luminescence of EuIII and YbIII ions.
1 Ln(β-diketonate) 3 (Ln = Eu, Yb) 单元与配合物 1 部分之间的比率,表明形成了 Au 2 Ln 2 配合物。Au 2 Ln 2 (Ln = Eu, Yb)溶液的发光滴定和发光量子产率表明,能量从双核金(I)天线1-5到Eu III和Yb III中心有效转移,并且所有配合物 1-5 是用于敏化 Eu III 和 Yb III 离子的可见光和 NIR 发光的良好能量供体。
Structural and Photophysical Studies on Geometric (Er<sub>2</sub>Yb<sub>2</sub>/Yb<sub>2</sub>Er<sub>2</sub>) and Configurational (EuTb<sub>3</sub>/Eu<sub>3</sub>Tb) Isomers of Heterotetranuclear Lanthanide(III) Complexes
Heterotetranuclear geometrical (Er2Yb2/Yb2Er2) and configuational (EuTb3/Eu3Tb) isomeric lanthanide(III) complexes have been synthesized and characterized by spectroscopy as well as X-ray crystallography. The geometric Er2Yb2/Yb2Er2 isomers exhibit dual emissions from both erbium(III) and ytterbium(III) ions. For the EuTb3/Eu3Tb configurationalisomers, the TbIII subunits transfer energy to the EuIII
合成了四核几何(Er 2 Yb 2 / Yb 2 Er 2)和构型(EuTb 3 / Eu 3 Tb)异构体镧系元素(III)配合物,并通过光谱学和X射线晶体学对其进行了表征。几何Er 2 Yb 2 / Yb 2 Er 2异构体显示出from(III)和(III)离子的双重发射。对于EuTb 3 / Eu 3 Tb构型异构体,Tb III亚基将能量转移到EuTb 3络合物中的Eu III中心,而TbTbEu 3络合物中的III离子主要用作结构稳定剂。