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本文以2-(3-碘苯基)吡啶(HIppy)为主配体,乙酰丙酮(acac)为辅助配体合成了[2-(3-碘代苯基)吡啶-C^N][2,4-戊二酮-O^O]钯(Ⅱ)[(Ippy)Pd(acac)]配合物,通过核磁、质谱、单晶衍射等数据确定其结构.为了考察碘原子对配合物的光物理性质影响,合成了非碘代的配合物[(ppy)Pd(acac)].单晶结构表明,金属钯与配体形成变形的平面正方形结构,螯合平面C007Pd01N005与O003Pd01O004之间的二面角为3.72°.室温下,配合物(Ippy)Pd(acac)和(ppy)Pd(acac)都具有明显的光致发光(PL)光谱,在四氢呋喃(THF)溶液中两个配合物最大PL光谱在400 nm处,伴随着一个422 nm的肩峰.发光寿命分别为14.9和18.5 ns,我们将室温发光归属于金属微扰配体的单线态(~1LC)荧光.(ppy)Pd(acac)和(Ippy)Pd(acac)在THF溶液中PL量子效率为0.012和0.18,含碘的配合物和不含碘的配合物量子效率相差15倍.可见在配体中的苯环上引入碘原子有效降低了激发态非辐射衰减,从而显著提升了配合物的PL量子效率.相反,在低温77 K下,两个配合物呈现出相同的具有精细结构的PL光谱,发射峰分别在460、484、495和521 nm处,配合物的寿命分别为0.138和0.162 ms,配合物在低温下的发射光谱归属于~3MLCT和~3LC三线态混合的磷光.(Ippy)Pd(acac)在室温时,PL发射光谱的CIE坐标值为(0.169,0.091),是一种色纯度较高的蓝光配合物.
In this paper, [2- (3-iodophenyl) pyridine-C ^ N] [2 (Ippy) Pd (acac)] complex was determined by NMR, MS, single crystal diffraction and so on.In order to investigate the effect of iodine atom on the light of the complex (Ppy) Pd (acac)]. The single crystal structure shows that the metal palladium and the ligand form a deformed planar square structure, the two sides between the chelating planes C007Pd01N005 and O003Pd01O004 The angle was 3.72 °. Both the complexes (Ippy) Pd (acac) and (ppy) Pd (acac) had obvious photoluminescence (PL) spectra at room temperature, At 400 nm, with a shoulder at 422 nm, the luminescence lifetime was 14.9 and 18.5 ns, respectively, and we assigned luminescence at room temperature to the singlet (~ 1 LC) fluorescence of the metal perturbation ligand. (Ppy) Pd (acac ) And (Ippy) Pd (acac) in THF solution, the quantum efficiency of PL was 0.012 and 0.18, respectively, and the difference between the quantum efficiencies of iodine-containing complexes and iodine-free complexes was 15 times. Atoms effectively reduce the excited state of non-radiation And the PL quantum efficiencies of the complexes were significantly increased.On the contrary, the two complexes exhibited the same PL spectra with fine structure at the low temperature of 77 K with emission peaks at 460, 484, 495 and 521 nm respectively, The lifetime of the complexes were 0.138 and 0.162 ms, respectively. The emission spectra of the complexes at low temperature were attributed to the mixed phosphorescence of ~3 MLCT and ~3 LC triplet states. (Ippy) Pd (acac) At room temperature, the PL emission spectrum CIE coordinates (0.169,0.091), is a high purity blue complex.