Crystal engineering of lattice metrics of perhalometallate salts and MOFs

  • Adams C
  • Haddow M
  • Lusi M
 et al. 
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The synthesis of the salt 3 and metallo-organic framework (MOF) [{(4,4(')-bipy)CoBr(2)}(n)] 4 by a range of solid state (mechanochemical and thermochemical) and solution methods is reported; they are isostructural with their respective chloride analogues 1 and 2. 3 and 4 can be interconverted by means of HBr elimination and absorption. Single phases of controlled composition and general formula [4,4(')-H(2)bipy][CoBr(4-x)Cl(x)] 5(x) may be prepared from 2 and 4 by solid--gas reactions involving HBr or HCl respectively. Crystalline single phase samples of 5(x) and [{(4,4(')-bipy)CoBr(2-x)Cl(x)}(n)] 6(x) were prepared by solid-state mechanochemical routes, allowing fine control over the composition and unit cell volume of the product. Collectively these methods enable continuous variation of the unit cell dimensions of the salts [4,4(')-H(2)bipy][CoBr(4-x)Cl(x)] (5(x)) and the MOFs [{(4,4(')-bipy)CoBr(2-x)Cl(x)}(n)] (6(x)) by varying the bromide to chloride ratio and establish a means of controlling MOF composition and the lattice metrics, and so the physical and chemical properties that derive from it.

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  • C. J. Adams

  • M. F. Haddow

  • M. Lusi

  • A. G. Orpen

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