Crystal structure, solid-state NMR spectroscopic and photoluminescence studies of organic-inorganic hybrid materials (HL)(6) Ge-6(OH)(6)(hedp)(6) center dot 2(L)center dot nH(2)O, L = hqn or phen

International audience ; The cover picture shows the three-dimensional supramolecular arrangement of 1,10-phenanthroline (phen) residues in compound (Hphen)6[Ge6(OH)6(hedp)6]·2(phen)·20H2O (where H4hedp stands for etidronic acid). Protonated organic residues, Hphen+, π-π-stack along the [101] direction of the unit cell, which leads to the formation of columns that are interconnected through a series of weak C–H···π interactions with neighbouring 1,10-phenanthrolines. The resulting organic framework is highly porous and contains charge-balancing centrosymmetric hexameric anionic [Ge6(ν2-OH)6(C2H4O7P2)6]6– moieties within the channels and a large number of highly disordered water molecules (total available volume of ca. 2462 Å3 per unit cell). Details are discussed in the article by J. Rocha et al. on p. 4741 ff.