Self-assembly of ion-pair complexes

Solid-state structures of cobalt(II) complexes of 4-methylumbelliferone-8-methyleneiminodiacetic acid (H(3)muia), also named Calcein Blue, are presented. Interestingly, ion-pair complexes with different solvation in cation, namely, [Co(H2O)(4)(CH3CN)(2)][Co(muia)(H2O)(2)](2) (1) and [Co(H2O)(6)][CO2(muia)(2)(H2O)(2)]center dot 2CH(3)CN (2), exhibit self-assembly in one-pot crystallization. By variation of the experimental conditions, ID coordination polymer [{Co(H2O)(4)}{Co-2(muia)(2)(H2O)(2)}]center dot 11H(2)O (3), which can be considered a pseudo-supramolecular isomer, is obtained. Hydrogen bonding between the cation and anion core gives an interesting hydrogen-bonded network structure. The condensation of ion-pair complexes to a 1D coordination polymer by the influence of solvents is demonstrated.