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IR spectroscopy confirmed the presence of the biq and dca ligands in<jats:bold>1<\/jats:bold>. Its solid-state structure consists of discrete centrosymmetric binuclear copper(II) units with double end-to-end dca bridges. Each Cu<jats:sup>II<\/jats:sup>atom is in a distorted square-pyramidal environment with the equatorial plane formed by two nitrile N atoms from bridging dca groups, one of the two N atoms of the chelate biq molecule and one nitrile N atom from a terminal dca ligand, whereas the second biq N atom occupies the axial position. Thermal decomposition of<jats:bold>1<\/jats:bold>in an air atmosphere proceeds gradually, with copper(I) cyanide being the final decomposition product. Magnetic measurements revealed the formation of alternating spin chains and a relatively strong exchange interaction within the binuclear units was also confirmed by Broken Symmetry DFT (density functional theory) calculations.<\/jats:p>","DOI":"10.1107\/s205322961801375x","type":"journal-article","created":{"date-parts":[[2018,10,24]],"date-time":"2018-10-24T07:59:28Z","timestamp":1540367968000},"page":"1469-1476","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":2,"title":["Low-dimensional compounds containing cyanido groups. Part XXXV. 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