Unusual nitro-coordination of europium(iii) and terbium(iii) with pyridinyl ligands
作者:Ana de Bettencourt-Dias、Sebastian Bauer、Subha Viswanathan、Brandi C. Maull、Ayuk M. Ako
DOI:10.1039/c2dt31308a
日期:——
A new ligand family based on picoline, bipyridine and terpyridine containing a nitro moiety has been synthesized and its coordination and sensitization ability for lanthanide ions has been studied. Three new complexes were characterized by X-ray single crystal diffraction and all three show uncommon coordination of the nitro moiety to the lanthanide ion. 5cTb, a terpyridine-nitro derivative with Tb(NO3)3, crystallizes in the orthorhombic space group Pbca with a = 15.125(3), b = 13.776(3), c = 18.716(4) Å, and V = 3899.8(13) Å3 and is isostructural with its Eu(III) analog (5cEu) with cell parameters a = 15.1341(4), b = 13.7070(4), c = 18.8277(5) Å. 6Eu, a tripodal amine with a nitro-derivatized pyridine with Eu(CF3SO3)3, crystallizes in the triclinic space group P with a = 11.067(2), b = 11.633(2), c = 12.772(3) Å, α = 110.94(3), β = 97.49(3), γ = 91.42(3)° and V = 1518.1(5) Å3. Finally, ligand 5a, a bipyridine-nitro derivative, crystallizes in the orthorhombic space group P21/n with a = 3.7128(3), b = 11.7806(8), c = 19.9856(14) Å, β = 92.925(2)° and V = 873.01(11) Å3. All four ligands show sensitization of Eu(III) and Tb(III) luminescence.
一种基于吡啶、双吡啶和三吡啶并含有硝基官能团的新配体家族已被合成,并研究了其对镧系离子的配位和敏化能力。通过X射线单晶衍射表征了三个新配合物,三个配合物均显示出硝基官能团与镧系离子之间的不寻常配位。5cTb是一种与Tb(NO3)3配位的三吡啶-硝基衍生物,结晶于正交晶系Pbca,晶胞参数为a = 15.125(3), b = 13.776(3), c = 18.716(4) Å, V = 3899.8(13) ų,与其Eu(III)类似物(5cEu)具有相同的结构,晶胞参数为a = 15.1341(4), b = 13.7070(4), c = 18.8277(5) Å。6Eu是一种与Eu(CF3SO3)3配位的三叉氨基硝基取代吡啶,结晶于三斜晶系P,晶胞参数为a = 11.067(2), b = 11.633(2), c = 12.772(3) Å,α = 110.94(3), β = 97.49(3), γ = 91.42(3)°,V = 1518.1(5) ų。最后,配体5a是双吡啶-硝基衍生物,结晶于正交晶系P21/n,晶胞参数为a = 3.7128(3), b = 11.7806(8), c = 19.9856(14) Å,β = 92.925(2)°,V = 873.01(11) ų。所有四种配体均显示出对Eu(III)和Tb(III)的发光敏化。