Crystallisation of H3BTC, H3TPO or H(2)SDA with M-II (M = Co, Mn or Zn) and 2,2 '-bipyridyl: design and control of co-ordination architecture, and magnetic properties (H3BTC = benzene-1,3,5-tricarboxylic acid, H3TPO = tris(4-carboxylphenyl)phosphine oxide, H(2)SDA = cis-stilbene-4,4 '-dicarboxylic acid)

The hydrothermal reaction of benzene-1,3,5-tricarboxylic acid (H3BTC) with M-II (M=Mn, Co or Zn), tris(4-carboxyphenyl)phosphine oxide (H3TPO) or cis-stilbene-4,4'-dicarboxylic acid (H(2)SDA) with Co-II and 2,2'-bipyridyl (BIPY) gave 1-D co-ordination networks formulated as: [M(HBTC)(BIPY)(H2O)] (M=Mn 1, Co 2, or Zn 3; [Co-3(BTC)(2)(BIPY)(2)(H2O)(6)]. 4H(2)O 4, [Co-3(TPO)(2)(BIPY)(2)(H2O)(6)]. xH(2)O 5 and [Co(SDA)(BIPY)(H2O)] 6. Structures 1 and 2 consist of double stranded chains of alternating HBTC dianions and dimeric units M-II-M-II linked by two mu-(1,1) bridging carboxylates. Magnetic properties of 1 and 2 indicate the presence of ferromagnetic exchange interactions within the dimers. Structures 4 and 5 consist of chains with a molecular ladder motif which are stacked creating large channels lined by hydrated cobalt(II) ions. The H2O/D2O solvent exchange in structure 5, studied by infrared spectroscopy and thermal gravimetric analysis-mass spectrometry, provides evidence for the porosity and zeolitic nature of the material.