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Silver complexes of cyclic hexachlorotriphosphazene.
Marcin Gonsior1, Sasa Antonijevic, Ingo Krossing
1Universität Karlsruhe TH, Institut für Anorganische Chemie, Engesserstrasse Geb. 30.45, 76128 Karlsruhe (Germany).
Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 24, 2005
Summary
This study reports the first solid-state structures of silver-coordinated phosphazenes (P3N3Cl6). These complexes exhibit weak silver ion affinity, with phosphazene acting as a weak Lewis base, and are thermally stable.
Area of Science:
- Inorganic Chemistry
- Organometallic Chemistry
- Solid-State Chemistry
Background:
- Phosphazenes (P3N3X6) are inorganic heterocyclic compounds with potential applications in materials science.
- Understanding their coordination chemistry with metal ions is crucial for developing new functional materials.
- Previous studies have not fully elucidated the solid-state structures and coordination behavior of phosphazenes with silver ions.
Purpose of the Study:
- To synthesize and characterize novel silver-phosphazene complexes in the solid state.
- To investigate the coordination modes and silver ion affinity of phosphazene ligands.
- To assess the thermal stability and potential reaction pathways of these complexes.
Main Methods:
- Synthesis of silver-phosphazene complexes using P3N3Cl6 and silver salts with weakly coordinating anions.
- X-ray crystallography for determining solid-state structures.
- NMR and vibrational spectroscopy for compound characterization.
- Quantum chemical calculations (MP2/TZVPP, COSMO) for energetics and chemical shifts.
Main Results:
- First solid-state structures of silver-coordinated P3N3Cl6 complexes (1, 2, 3) were obtained.
- Phosphazene exhibits very weak silver ion affinity, comparable to P4 and CH2Cl2.
- Complexes are thermally stable up to 60°C, with no observed formation of P3N3Cl5+ or AgCl.
- Calculated formation energies indicate exergonic cation formation in dichloromethane.
Conclusions:
- The coordination of P3N3Cl6 to Ag+ is weak, highlighting the limited Lewis basicity of the phosphazene ligand.
- The synthesized complexes are robust and do not readily decompose under moderate heating.
- Quantum chemical calculations provide insights into reaction pathways and energetics, guiding future synthetic efforts for related phosphazene salts.