Supramolecular materials: molecular packing of tetranitrotetrapropoxycalix[4]arene in highly stable films with second-order nonlinear optical properties

Paul J.A. Kenis, Oscar F.J. Noordman, Holger Schönherr, Esther G. Kerver, Bianca H.M. Snellink‐Ruël, Gerrit J. van Hummel, Sybolt Harkema, Cornelis P.J.M. van der Vorst, Jeff Hare, Stephen J. Picken, Johan F.J. Engbersen, Niek F. van Hulst, G. Julius Vancso, David N. Reinhoudt