Jump to main content
Jump to site search

Issue 9, 2009
Previous Article Next Article

Grafting ligands to direct the self-assembly of Co/Ni2+ substituted polyoxometalate clusters

Author affiliations

Abstract

Four transition metal incorporated phosphotungstates have been synthesized through the reaction of Na2WO4, H3PO4, Co/Ni(NO3)2, and the multifunctional amine N,N′-Bis(2-hydroxyethyl) piperazine (bhep). Na2{MHbhep(H2O)4}[PW10M2O38{Hbhep}2] M = Co2+ (1), and Ni2+(2) represent rare examples of complete transition metal chelate encapsulation within a Keggin polyanion. Slight modification of the reaction procedure yielding 1 also yields the two dimensional material (H2bhep)3Na4[Co4(H2O)2(PW9O34)2].15H2O (3). Finally, the isolation of a phosphotungstate cluster containing 18 Co2+ ions is achieved through the bridging of two [Co9(OH)3(H2O)6(HPO4)2(B-α-PW9O34)3]16−clusters by the bhep ligand to form the [{Co9(OH)3(H2O)3(HPO4)2(B-α-PW9O34)3}2 {C8H18N2O2}3]32− dimer (4). The dimerisation process is achieved via the monodentate coordination of the hydroxyl groups from three bhep ligands to each polyanion by displacing the water ligands typically found coordinated to the {Co9} core forming a nanoscale cylinder-like capsule capped by two {Co9P5W27} with three BHEP-based ligand spacers.

Graphical abstract: Grafting ligands to direct the self-assembly of Co/Ni2+ substituted polyoxometalate clusters

Back to tab navigation

Supplementary files

Publication details

The article was received on 14 Aug 2008, accepted on 24 Dec 2008 and first published on 22 Jan 2009


Article type: Paper
DOI: 10.1039/B814076F
Citation: Dalton Trans., 2009,0, 1587-1592
  •   Request permissions

    Grafting ligands to direct the self-assembly of Co/Ni2+ substituted polyoxometalate clusters

    C. Ritchie, T. Boyd, D. Long, E. Ditzel and L. Cronin, Dalton Trans., 2009, 0, 1587
    DOI: 10.1039/B814076F

Search articles by author

Spotlight

Advertisements