Poly[3-methyl-1,3-oxazolidin-2-iminium[µ3-cyanido-tri-µ2-cyanido-κ9C:N-tricuprate(I)]]

The unexpected formation of an oxazole ring has occurred during synthesis of a copper(I) cyanide network polymer as part of our ongoing studies of the structural chemistry of these networks. Crystals of the title compound were formed during the synthesis of a previously reported CuCN network solid containing protonated N-methylethanolamine and have been characterized by single crystal X-ray structure analysis. The structure shows well-defined oxazole-2-iminium cations sitting in continuous channels along the short a-axis of the crystal in a new three-dimensional copper(I) cyanide polymeric network. Evidently, a reaction has occurred between the cyanide ion and the protonated N-methylethanolamine base.

Shershnev coefficient is a basic characteristic of the structure of a crystallizing network polymer

The values of molecular weight between nodes in cross-linked polyethylene obtained by the method of swelling and the method of determining the equilibrium modulus are considered. It has been shown that it is not possible to achieve uniform values of molecular weight between mesh points using these two methods. The ratio between the molecular weights located between the nodes of the network, it is proposed to call the "Shershnev coefficient".