Search

Reactions of CuCl2, K3[Fe(CN)6]/K4[Fe(CN)6], and pyrazine (pyz) inwatersolution at 160 °C/170 °C for 6 days led to two luminescentsupramolecular isomers with stoichiometry [Cu2(pyz)(CN)2]·[CuCN] (1and 2), which show3D pseudopolyrotaxane structures with 1D [Cu(CN)]∞chains penetrating 2D [Cu2(pyz)(CN)2] sheets.Isomer 1contains linear, trigonal, and tetrahedral Cu(I)atoms, which are linked by pyz and cyanide groups into unprecedented(3,4)-connected Shubnikov-type (5,34) sheets,and these sheets are penetrated by [Cu(CN)]∞chainsvia unsupported CuI–CuIinteractions.In contrast, the [Cu2(pyz)(CN)2] sheets in isomer 2can be viewed as a classical (6,3)-topological brick walllayer, which are also penetrated by [Cu(CN)]∞chainsin the absence of cuprophilicity. Schematically, the brick wall andShubnikov-type (5,34) nets can be formed viaarrangement of brick rows in ABAB and ABBA modes, respectively. Itis worth noting that cyanide sources played a crucial role in theformation of supramolecular isomers. 1and 2show strong photoluminescence related to the various local coordinationgeometries of copper atoms and weak cuprophilic interactions. [ABSTRACT FROM AUTHOR]