A set of CuIXL coordination polymers (X = Cl, Br, I; L = derivatives of pyrazine and bipyridine) with double-stranded staircase structures was analyzed by X-ray crystallography and luminescence spectroscopy to find a relationship between the structure and luminescence properties of the polymers. Our measurements have proved that luminescence emission wavelengths varied between 500â750 nm, after the polymers were irradiated by light with a wavelength of 370 nm. Although each coordination polymer has shown different emission maximum, we observed several interesting trends related to the structure of the compounds. There is a clear correlation between the emission maxima and the halide size and/or CuâX distance, respectively. On the other hand, the substitution of the ligand L (pyrazine derivatives, 4,4â²-bipyridine) has no significant contribution to the emission spectra. This observation supports the theory that the halide to metal charge transfer (XMCT) plays a key role in the photoluminescence of staircase polymers.
我们通过 X 射线晶体学和发光光谱学分析了一组具有双链阶梯结构的 CuIXL 配位聚合物(X = Cl、Br、I;L =
吡嗪和双
吡啶的衍
生物),以找到聚合物结构与发光特性之间的关系。测量结果表明,在波长为 370 纳米的光照射下,聚合物的发光波长在 500-750 纳米之间变化。虽然每种配位聚合物的发射最大值各不相同,但我们观察到了几种与化合物结构有关的有趣趋势。发射最大值分别与卤化物尺寸和/或 CuâX 间距有明显的相关性。另一方面,
配体 L 的替换(
吡嗪衍
生物、4,4â²-联
吡啶)对发射光谱没有明显影响。这一观察结果支持了卤化物到
金属的电荷转移(X
MCT)在阶梯聚合物的光致发光中起关键作用的理论。