Design and syntheses of two novel supermolecular frameworks through weak interactions

Two novel supermolecular frameworks constructed by 2,20-biquinoline-4,40-dicarboxylic acid (H2bqdc) were synthesized and their crystal structures were characterized by single crystal X-ray diffraction. Complex [Cu(C12H30N6)](NaOH)(bqdc)$2H2O (1) crystallizes in the triclinic space group P-1, with aZ7.181(7), bZ8.869(9), cZ14.105(14) A° , aZ101.315(8), bZ100.487(6), gZ97.282(14)8 and ZZ1. It exhibits a 2-D framework constructed through hydrogen bonds. The macrocyclic-Cu(II) units decorate to the sheet also through H-bondings. Complex [Ni(en)2(H2O)2](bqdc)$2H2O (2) crystallizes in the triclinic space group P-1, with aZ6.86030(10), bZ7.2061(2), cZ 13.7801(4) A° , aZ92.756(2), bZ101.2050(10), gZ101.7210(10)8 and ZZ2. This complex exhibits a 3-D frameworks constructed also through weak interactions, especially H-bonding and p–p stacking. Interestingly, a hexa-oxygen ring was found in this structure formed by four water molecules and two carboxyl groups through hydrogen bonds. Thermography analyses of the two complexes were also tested. q 2004 Elsevier B.V. All rights reserved.