ISSN:
1434-1948
Keywords:
Phosphazenes
;
Phosphazenates
;
Aluminium
;
Zinc
;
Multianionic ligands
;
Chemistry
;
General Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The amino-substituted phosphazene P3N3(NHCy)61 reacts as a multiprotic acid undergoing full deprotonation in the presence of Me3Al and Et2Zn, respectively, which results in the formation of multinuclear metal phosphazenates: Trimethyl aluminium deprotonates 1 with evolution of six equivalents of methane to give the pentanuclear organoaluminium complex [(thfMeAl)(Me2Al)4{P3N3(NCy)6}] 2. Diethylzinc deprotonates 1 yielding the hexanuclear zinc complex [(EtZn)6{P3N3(NCy)6}] 3. The higher homologue P4N4(NHCy)84 reacts with diethylzinc undergoing sixfold deprotonation giving the hexanuclear complex [(EtZn)6{P4N4(NHCy)2(NCy)6}] 5, where two NH functions remain protonated. All three metal complexes 2, 3 and 5 are soluble in aprotic organic solvents. The highly charged phosphazenate ligands contain three and four PN4 tetrahedra which are fused in a corner-sharing manner forming P3N3 and P4N4 ring structures, respectively. These are isoelectronic with meta-silicate anions, but in addition equiped with organic groups at terminally arranged N atoms. Both phosphazenate ligands contain various coordination sites and show a high flexibility of their central P-N ring conformation toward the complexed organometallic framework.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
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