TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Network: The network further comprises a guest species and an adsorbed chemical species. The surface area of the network is 1 - 20,000 m2/g.Preferred Component: The boron-containing clusters comprises at least 10 (preferably 100) boron-containing clusters. The linking groups comprises at least 10 (preferably 100) linking groups. The boron-containing cluster includes a structure of formula BxQyCz (preferably -B(-O-)-O- or a group of formula (i), (ii) or (iii)). The linking group includes at least one cyclic components selected from saturated or unsaturated optionally substituted hydrocarbon, optionally substituted aromatic rings, optionally substituted heteroaromatic rings, optionally substituted nonaromatic rings or optionally substituted nonaromatic heterocyclic rings (preferably 10 groups are given in the specification e.g. a group of formula (iv), (v) or (vi)). A portion of the linking groups comprise a linking group which forms a first bond with a first boron-containing cluster and a second bond with a second boron-containing cluster such that the angle between the first bond and the second bond is less than 180degrees (preferably a group of formula (vii) or (viii)). The adsorbed chemical species is selected from ammonia, carbon dioxide, carbon monoxide, hydrogen, amines, methane, oxygen, argon, nitrogen, argon, organic dyes and/or polycyclic organic molecules.Q = oxygen, sulfur, nitrogen or phosphorus;x and y = integers such that the valency of B;z = 0 - 6;R, R' and R" = H, alkyl, aryl or halogen;R1 - R16 = G1;G1 = H, alkyl, OH, alkoxy, sulfur-containing groups (e.g. thioalkoxy), silicon-containing groups, halogen, nitro, amino, cyano, boron-containing groups, phosphorus-containing groups, carboxylic acids or esters;T = a tetrahedral atom or a tetrahedral group or cluster;n = greater than or equal to 1;R20 - R29 = G1 or a bond to a member from the boron containing cluster.Provided that when the portion of the linking groups is (vii) or (viii) then at least two groups of R1 - R6 or R1 - R10 are bonds to two distinct members of the boron containing clusters such that the bonds to the two distinct members are at an angle less than 180degrees.