A Metal Coordination Polymer with Hexagonal Diamondoid (or Lonsdaleite) Network Topology

The Cu(II) complex [Cu2(scp11)2(H2O)2] (1) when recrystallized in DMF/MeCN solvent mixture gave dark
green cubic single crystals of [Cu2(scp11)2]·H2O (2) (cubic space group, Ia-3d, No. 230). The three-dimensional network
structure has hexagonal diamondoid (or Lonsdaleite) architecture (if the net is defined by considering four fused dinuclear
units as a single node) with starlike channels along the body diagonal of the unit cell and partially occupied guest water
molecules, leaving about 27% empty space in the crystal lattice. Compound 1 on crystallization from DMF/acetone solvent
mixture afforded single crystals of 2 and [Cu2(scp11)2(H2O)2]·2Me2CO (3), which has one-dimensional hydrogen-bonded
polymeric structure in the solid-state (triclinic space group P1̄, No. 2). When the precipitating solvent is evaporated from
the solution, 2 and 3 slowly converted to microsize tubular crystals of 1.