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High-Nuclear Organometallic Copper(I)-Alkynide Clusters: Thermochromic Near-Infrared Luminescence and Solution
Hong-Yan Zhuo1, Hai-Feng Su2, Zhao-Zhen Cao1
1Key Lab for Colloid and Interface Chemistry of Education Ministry, School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, P. R. China.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 13, 2016
Summary
This study introduces novel copper(I) alkynyl clusters with unique thermochromic luminescence properties. These air-stable materials offer potential for advanced optical applications due to their near-infrared emission and temperature-dependent color changes.
Area of Science:
- Inorganic Chemistry
- Materials Science
- Photochemistry
Background:
- Copper(I) alkynyl clusters are of interest for their unique electronic and optical properties.
- Developing stable, high-nuclearity copper clusters with tunable luminescence remains a challenge.
Purpose of the Study:
- To synthesize and characterize novel high-nuclearity copper(I) alkynyl clusters.
- To investigate the thermochromic luminescence behavior of these clusters.
- To elucidate the structural and electronic factors governing their emissive properties.
Main Methods:
- Reaction of copper(II) trifluoroacetate with tert-butylacetylene in the presence of copper powder.
- Characterization using electrospray ionization mass spectrometry (ESI-MS) and X-ray single-crystal analysis.
- Variable-temperature luminescence spectroscopy to study thermochromic effects.
Main Results:
- Two air-stable clusters, [CuI15(tBuC≡C)10(CF3COO)5]⋅tBuC≡CH and [CuI16(tBuC≡C)12(CF3COO)4(CH3OH)2], were synthesized.
- Both clusters exhibit strong thermochromic luminescence in the near-infrared (NIR) region.
- Cluster 1 shows a red-shift from 710 nm to 793 nm with decreasing temperature, while Cluster 2 shows a more complex shift.
- ESI-MS confirmed the stability of the cluster cores in solution.
- Structural analysis revealed cuprophilic interactions influencing the excited state properties.
Conclusions:
- A new synthetic route for high-nuclearity copper(I) alkynyl clusters has been established.
- The study provides insights into the mechanism of thermochromic luminescence in these systems.
- These clusters represent promising NIR-emissive materials with significant thermochromic characteristics.
![[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59739.jpg&w=3840&q=50)
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