Ation linked bonds

This report was the first of its type to show the ability of such a large covalently linked carbohydrate (neomycin) to aid in RNA-DNA hybrid complex-ation. N-Neo-conjugate and a 7-base-long RNA sequence present in a-sarcin loop can form a stable hybrid duplex. The stability of a hybrid duplex with addition of one neomycin equivalent is comparable to the stability of a hybrid duplex where the DNA has a covalent bond to neomycin. The presence of a single mismatch decreases the melting temperature of both neomycin-conjugated... 

A stabilization of the chalcogen(II) dihalides is possible by complex-ation with various electron pair donors (see Section III,D). A stabilization of the simple molecular species is also obtained if the halogens are substituted by pseudo-halogens. This situation is similar to the anionic halo- and pseudo-haloselenates(II) (Section III,B). As examples, Se(CN)2, Se(SCN)2, and Se(SeCN)2 could be prepared in crystalline form (182, 273). In Se(SCN)2 and Se(SeCN)2 the molecules are linked via secondary Se-"N bonds to form chains, with a distorted square planar coordination of 2 S(Se) and 2 N around the central Se (182). 

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