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A copper(II) perchlorate-promoted tandem reaction of internal alkynol and salicyl N-tosylhydrazone provides a novel, concise method for constructing isochromeno[3,4-b]chromene in 35-94% yields. The tandem reaction involves cycloisomerization, formal [4+2] cycloaddition and an elimination process. [ABSTRACT FROM AUTHOR]

Supramolecular assembly and on-surface synthesis are two widely-used methods for constructing low-dimensional molecular nanostructures on surfaces. Here we describe an approach that combines both methods to create two-dimensional metal-organic networks with exceptionally large pores. [ABSTRACT FROM AUTHOR]

On a Au(111) surface, a mixture of two types of molecular ligands assembles with Cu generating two homogeneous and one heterogeneous metallo-supramolecular structures owing to same pyridyl–Cu–pyridyl coordination. The proportion of the three phases in the output structures is regulated by adjusting the ratio of the two components in the input molecular mixture. As the ratio approaches the stoichiometric value of the heterogeneous structure, one of the ligands is 100% incorporated in the heterogeneous phase, manifesting a unique amplification behaviour in this multiple output self-assembly. [ABSTRACT FROM AUTHOR]