Experiment4 (1).doc - Cyclotriphosphazene 1 Experiment 4 Preparation and Characterisation of a Substituted Cyclotriphosphazene Experiment 4 Preparation

Experiment4 (1).doc - Cyclotriphosphazene 1 Experiment 4...

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Experiment 4 Preparation and Characterisation of a Substituted Cyclotriphosphazene Cyclotriphosphazene- 1
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Aims to functionalise hexachlorotriphosphazene to characterise the product by spectroscopic means to explore the bonding in inorganic ring systems Introduction Discovered as long ago as 1834, phosphazenes are formally unsaturated P(V) compounds containing -P=N- units, which can self associate into rings and chains to give structures of alternating phosphorus and nitrogen atoms. Of particular interest are the cyclic trimers, e.g., (NPCl 2 ) 3 because like for borazine (B 3 N 3 H 6 ), it can be argued that these represent inorganic forms of benzene (C 6 H 6 ) since the six-membered (NP) 3 rings are planar and the N-P bonds are all equivalent in length, being shorter than single N-P bonds. However, this view is rather simplistic, as unlike in benzene, the -bonding in cyclophosphazenes involves both p and d orbitals. Experimental distinctions can also be seen, e.g., phosphazenes are much more difficult to reduce than aromatic organic compounds. One of the simplest methods of preparing a phosphazene is by the following reaction: NH 4 Cl + PCl 5 "1/n(NPCl 2 ) n " + 4 HCl
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  • Spring '17
  • Alvin
  • Chemistry, Laboratory glassware, crude product, ml conical flask, inorganic ring systems, potassium 4-nitrophenoxide

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