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Molecular, 1D and 2D assemblies from hexakis(3-pyridyloxy)cyclophosphazene containing 20-membered metallamacrocyclic motifs

Dalton Transactions, ISSN: 1477-9234, Vol: 45, Issue: 5, Page: 2273-2283
2016
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Article Description

The coordination behaviour of hexakis(3-pyridyloxy)cyclophosphazene (L) towards divalent metal ions is described. The reaction of L with hydrated metal nitrates afforded [{NP(O-CHN-3)}{Zn(HO)(NO)}{Zn(HO)(NO)}][NO]·4nHO·nCHOH (1), [{NP(O-CHN-3)}{Zn(HO)(NO)}{Cu(NO)}][NO]·4nHO·nCHCN (2), [{NP(O-CHN-3)}{(NO)Cd-(μ-(NO)-Cd(NO)(μ-(NO)Cd(NO)}]·2nCHOH·3nHO (3), and [{NP(O-CHN-3)}{Cd(HO)(NO)}][NO]·9HO (4). 1 and 2 are one-dimensional coordination polymers while 3 is a two-dimensional coordination polymer. On the other hand 4 is a molecular metallamacrocycle. A common feature of 1-4 is the presence of a 20-membered dimetallamacrocyclic motif constructed through the involvement of a pair of cyclophosphazene ligands through their geminal pyridyloxy substituents. The P-N bond distances in L and its metal complexes 1-4 are nearly the same indicating the flexible nature of the coordination pyridyloxy arms present on the cyclophosphazene scaffold.

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