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Coordination in supramolecular assemblies was investigated by reacting a series of lanthanide cations (Ln 3+ ) and a new alkyl-substituted cucurbituril, the ortho-tetramethyl-substituted cucurbituril (o-TMeQ[6]), in the presence of cadmium nitrate as an inorganic structure inducer in neutral solution. X-ray diffraction analysis revealed that the coordination of lanthanide cations gives rise to two isomorphous groups bound to three and eight isomorphous compounds, respectively. One group is typical of the coordination of o-TMeQ[6] with light lanthanide cations such as Nd 3+ , Sm 3+ and Eu 3+ , while the other group is characteristic of the coordination of o-TMeQ[6] with heavy lanthanide cations such as Gd 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ , Yb 3+ and Lu 3+ . Most interestingly, no solid crystals were obtained for any compounds containing La, Ce, or Pr, suggesting that these compounds may be suitable for the separation of heavier lanthanide cations from their lighter counterparts.

Keywords: Supramolecular chemistry / Macrocycles / Alkaline earth metals, a polydentate ligand, has been synthesized and isolated in a controlled manner by using a dimer of dimethyl-substituted glycoluril and a dimer of unsubstituted glycoluril. Coordination assemblies have been investigated by reactions between alkaline earth cations and o-TMeQ [6] in the presence of [CdCl 4 ] 2-, a structure inducer, in HCl aqueous solution. X-

Benzofuran[3,2-d]pyrimidine derivatives have good biological activity. This paper reported the synthesis of six compounds of benzofuran[3,2-d]pyrimidine derivatives. There structures were confirmed by EI-MS, 1 H NMR, 13 C NMR and single crystal X-ray diffraction analysis. The single crystal of 2-chloro-4-(N,N-diethyl-amino)-8-nitro-benzofuran[3,2-d]pyrimidine was obtained by recrystallization from chloroform solution. It crystallized in the monoclinic system, P21/c space group. The target compounds were screened in vitro anticancer activity using human lung cancer cell line A549 cells and human leukemia cell line K562 cells.