Sensitization of lanthanide luminescence by two different Pt-->Ln energy transfer pathways in PtLn3 heterotetranuclear complexes with 5-ethynyl-2,2'-bipyridine.
Reactions of 5-[2-(trimethylsilyl)-1-ethynyl]-2,2'-bipyridine (Me3SiC-Cbpy) with Pt(bpy)C12 (bpy = 2,2'-bipyridine) and Pt(bpyC[triple bond]C-C[triple bond]Cbpy)Cl2 (bpyC[triple bond]C-C[triple bond]Cbpy=bis(2,2'-bipyridin-5-yl)butadiyne) induced isolation of Pt(bpy)(C[triple bond]Cbpy)2 (1) and Pt(bpyC[triple bond]C-C[triple bond]Cbpy)(C[triple bond]Cbpy)2 (5), respectively. Incorporating Ln(hfac)3(H2O)2 (hfac = hexafluoroacetylacetone) with 1 or 5 gave the corresponding PtLn2 (Ln = Nd (2), Eu (3), Yb (4)) or PtLn3 arrays (Ln=Nd (6), Eu (7), Gd (8), Yb (9)). With excitation at 360 < or = lamda(ex)0 < or =480 nm, which is the MLCT absorption region of the Pt(2,2'-bipyridyl)(acetylide)2 chromophore, sensitized lanthanide luminescence is successfully attained by efficient Pt-->Ln energy transfer from the Pt(II) antenna chromophores. In contrast with quite efficient Pt-->Ln energy transfer in the Pt-C[triple bond]Cbpy-Ln(Pt...Ln = 8.6 A) array, energy transfer transmitted across the Pt-bpyC[triple bond]C-C[triple bond]Cbpy-Ln(Pt...Ln = 13.3 A) array is less efficient owing to the much longer Pt...Ln separation in the latter.
Xu
Hai-Bing
HB
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China.
Zhang
Li-Yi
LY
Chen
Zhong-Hui
ZH
Shi
Lin-Xi
LX
Chen
Zhong-Ning
ZN
D003460:Crystallization; D018360:Crystallography, X-Ray; D006571:Heterocyclic Compounds / Q000737:chemistry*; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D049449:Luminescence; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000737:chemistry; D010984:Platinum / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared
C499743:5,5'-diethynyl-2,2'-bipyridine; D006571:Heterocyclic Compounds; D028581:Lanthanoid Series Elements; D009942:Organometallic Compounds; D011725:Pyridines; D010984:Platinum