Comparison of a dimeric and a monomeric indium-quinolinato complex: synthesis, structure and photoluminescence,New Journal of Chemistry

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Comparison of a dimeric and a monomeric indium-quinolinato complex: synthesis, structure and photoluminescence
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2021-1-19 , DOI: 10.1039/d0nj03865b
Orbett T. Alexander _{1,

2,

3,

4} , Mart M. Duvenhage _{2,

3,

4,

5} , Robin E. Kroon _{2,

3,

4,

5} , Alice Brink _{1,

2,

3,

4} , Hendrik G. Visser _{1,

2,

3,

4}

Affiliation

Two indium(III) complexes, mer-[In(Ox)₃]·2H₂O (1) and [In₂(Ox)₂Cl₂-μ-[κ²-O,O′-(Ox)₂]]·C₇H₈ (2) (Ox = 8-hydroxyquinolinate), were synthesized and characterised by multi-nuclear NMR in the solid and liquid states. The solid state ¹H-NMR spectra of both complexes confirmed the purity of the samples, but in solution it was found that 1 converted to the fac-isomer. The crystal structures of both complexes were determined by single crystal X-ray diffraction. As expected, the In–O bond distance for the bridging oxygen atom is the longest, 2.193 (13) Å. Solid state photoluminescence studies revealed that 1 and 2 showed emission at 530 nm and 500 nm, respectively, after excitation at 350 nm. Their respective quantum efficiencies were 13% and 20%. Lifetime measurements were conducted and the dimer showed a double exponential decay with two decay components recording 7.7 ns (30%) and 19.5 ns (70%), whereas the monomer recorded a mono-exponencial lifetime decay of 17.5 ns.

中文翻译：

二聚体和单体铟-喹啉基络合物的比较：合成，结构和光致发光

两个铟（III）络合物，聚体- [在（OX）₃ ]·2H ₂ O（1）和[在₂（OX）₂氯₂ -μ-[κ ² -O，O' - （OX）₂ ]合成了··C ₇ H ₈（2）（Ox = 8-羟基喹啉酸酯），并通过多核NMR对其进行了固态和液态表征。两种络合物的固态¹ H-NMR谱图均证实了样品的纯度，但在溶液中发现1转化为fac-异构体。两种配合物的晶体结构均通过单晶X射线衍射测定。不出所料，桥接氧原子的In–O键距离最长，为2.193（13）Å。固态光致发光研究表明，在350 nm激发后，1和2分别在530 nm和500 nm处发射。它们各自的量子效率分别为13％和20％。进行了寿命测量，二聚体显示出双指数衰减，其中两个衰减分量分别记录了7.7 ns（30％）和19.5 ns（70％），而单体记录了17.5 ns的单指数寿命。

更新日期：2021-01-19

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