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Diamondoids are hydrocarbons having a carbon scaffold comprised frompolymer-like composites of adamantane cages. The present paper describescomputed total energies and "SWB-tension" energies (often referred to as"strain" energies) for species having $n$ adamantane or diamantane unitssharing pairwise: one carbon atom (spiro-[n]adamantane orspiro-[$n$]diamantane); one C-C bond (one-bond-sharing-[$n$]adamantane orone-bond-sharing-[$n$]diamantane); or one chair-shaped hexagon of carbon atoms(1234-helical-cata-[$n$]diamantanes). Each of the five investigatedpolymer-like types is considered either as an acyclic or a cyclic chain ofadamantane- or diamantane-unit cages. With increasing $n$ values, SWB-tensionenergies for acyclic aggregates are found to increase linearly, while the netSWB-tension energies of cyclic aggregates often go thru a minimum at a suitablevalue of $n$. In all five cases, a limiting common energy per unit ($E/n$ ) isfound to be approached by both cyclic and acyclic chains as $n\to \infty $, asrevealed from plots of $E/n$ versus $1/n$ for acyclic chains and of $E/n$versus $1/n^2$ for cyclic chains.

Energies for cyclic and acyclic aggregations of adamantane and diamantane units sharing vertices, edges, or six-membered rings