TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The linking cluster comprises an identifiable association of atoms. The covalent bonds between each organic multidentate core and linking cluster, is formed using atom chosen from carbon, boron, oxygen, nitrogen and phosphorus, in which at least one of the atoms connecting the multidentate cores is oxygen. The organic multidentate core is covalently bonded to 2-4 mutidentate linking clusters. The mutidentate linking cluster is covalently bonded to 2-4 organic multidentate cores. The organic multidentate cores and linking clusters are heterogeneous. The organic multidentate cores comprise alternating tetrahedral and triangular multidentate cores. The pores comprise a sufficient number of accessible sites for atomic or molecular adsorption. The linking cluster is boron-containing linking cluster. The covalent-organic framework further contains a guest species and an interpenetrated covalent-organic framework, which increases surface area of the covalent-organic framework. The guest species is chosen from organic molecule (a) with molecular weight of 100 g/mol or less, organic molecule (b) with molecular weight of 300 g/mol or less, organic molecule (c) with molecular weight of 600 g/mol or less, organic molecule (d) with molecular weight of 600 g/mol or more, and organic molecule (e) having an aromatic ring, a polycyclic aromatic hydrocarbon and a metal complex of formula: MmXn (1).M=metal ion;X=anion chosen from group (XIV-XVII) of periodic table;m=1-10;andn=number to balance charge of metal cluster.Preferred Properties: The pores have surface area of 2000 m2/g or more, preferably 3000-18000 m2/g and more preferably 3000-6000 m2/g, and pore volume of 0.1-0.99 cm3/cm3, preferably 0.4-0.5 cm3/cm3. The covalent-organic framework has framework density of 0.17 g/cm3, and atomic coordinates (x, y and z) in the range of 0.7469, 0.303 and 0.8283, 0.8404, 0.4563 and 0.7607, 0.3583, 0.7655 and 0.8499, 0.9886, 0.0714 and 0.5531, and 1, 0 and 0.5.