Molecular Recognition And Self-Assembly Of Cobalt (â…¡/â…¢) Complexes Incorporating Cucurbiturils

In recent thirty years, organic macrocyclic the CBn become a hot topic in the field of supramolecular chemistry. Cucurbit[n]urils is Synthesised by glycoluril,it is a special pumpkin-shaped macrocyclic.The structure of CBn forms a a rigid hollow cavitand with two highly polar carbonyl openings, and thus has primarily been used as a synthetic receptor for selectively binding linear organic substrates supramolecular self-assembly. Unique structure of the macrocyclic CBn has the very good application prospect in the future, and molecular recognition of the Co (II) and Co (III) complexes and supramolecular self-assembly of CBn that is important for macrocyclic supramolecular chemistry and new supramolecular materialsThe supramolecular self-assembly application of CBn have been research in our lab. The structure of CBn forms a rigid hollow cavitand with two highly polar carbonyl openings for selective the alkali metal ion. We have found novel supramolecular structure of CB6 and Co (II) complexes, an anion-exchange synthetic strategy can be pursued. The structure of CBn Co (II) 8-hydroxyquinoline-5-sulphonic acid (Hqs) complexes have been synthezed and studied by X-ray crystal analysis.the results show that the crystal belongs to triclinic crystal system, space group P i, a=11.849(3), b= 12.490(2), c= 15.090(3) A, α=110.04(2), β=112.47(3),γ=91.91(2)°。Volume= 1903.7(9)A 3, Z=1, Dcalcd (g·cm-3)= 1.539,μ (mm-1)=0.395, R1[I>2σ(I)]=0.0598 and wR2 (all data)= 0.1475. The transition metal complexes exhibit a center-symmetric trans-N2O4 octahedral coordination geometry, whose four planar coordinate positions are occupied by the nitrogen and oxygen atoms of Hqs, and whose two axial sites by the water 0(1 W) atom, with the configurations remarkably distorted from the D2h symmetry for standard trans-N2O4 octahedral coordination due to the seriously twisted axial-coordination of the water molecules.The structures of complex as a similar linear coordination polymer, with the complex anion intercalated into the positively charged CB6-Na(I) coordination polymer via forming the water-bridging coordination bonds.The polymer is stabilized by the center-symmetric water-Hqs and water-CB6 H-bonding, as well as the CB6-Hqs shape-matching interactions around the transition metal ion.Supramolecular structure has been finished by Diamond program, and we have dicussed. The [Co(NH3)6]3+ complexes have been synthesized successfully.in solution, We compared the absorption curve by ultraviolet-visible spectrum. Further discussing its structure characteristics in the formation of supramolecular role in synthesis of complex crystal, it is a model for molecular recognition and self-assembly in the solution.