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Structure, solution assembly, and electroconductivity of nanosized argento-organic-cluster/framework templated by
Xiao-Yu Li1, Hai-Feng Su, Mohamedally Kurmoo
1Key Lab of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, P. R. China. dsun@sdu.edu.cn.
Nanoscale
|April 12, 2017
Summary
This study reveals novel silver clusters and frameworks templated by chromate, showcasing diverse structures like supertetrahedrons and snake-like tubes. These findings illuminate silver cluster assembly mechanisms and potential applications.
Area of Science:
- Coordination Chemistry
- Materials Science
- Nanotechnology
Background:
- Understanding the assembly of silver clusters and silver cluster-based metal-organic frameworks is crucial for designing new materials.
- Chromate's role as a template in directing the formation of complex silver-organic structures is an area of active research.
Purpose of the Study:
- To elucidate the structures and assembly mechanisms of silver clusters and silver cluster-based metal-organic frameworks.
- To investigate the templating effect of chromate in the presence of different thiolates on silver cluster formation.
Main Methods:
- Synthesis of four silver-organic clusters/frameworks using chromate and various thiolates (tBuC6H4S-, SiBu-, SiPr-).
- Structural characterization using X-ray diffraction.
- Electrospray ionization mass spectrometry (ESI-MS) to analyze species in solution.
- Electrochemical studies in sulfuric acid and conductivity measurements after iodine doping.
Main Results:
- Four distinct silver-organic structures were prepared, each featuring a core-shell architecture with inner chromate, an intermediate Ag-S aggregate, and organic moieties.
- Structures include a supertetrahedron (1), an undulated snake-like tube (2), a 7-connected kwh network (3), and chiral quartz frameworks (4).
- ESI-MS confirmed the stability of the core structure of (1) in solution and identified polynuclear silver-thiolate species as key building blocks for (2-4).
- Electrochemical properties and enhanced electrical conductivity upon doping were reported.
Conclusions:
- Chromate effectively templates the formation of diverse and complex silver-organic clusters and frameworks.
- The identified silver-thiolate species in solution are crucial precursors for constructing extended 1D and 3D motifs.
- The synthesized materials exhibit interesting electrochemical properties and potential for conductivity enhancement.