caa a22 4500 378943456 CHVBK 20180305123658.0 cr unu---uuuuu 161128e20040901xx s 000 0 eng 10.1524/zkri.219.9.558.44035 doi (NATIONALLICENCE)gruyter-10.1524/zkri.219.9.558.44035 Structure analysis and the existence of light-induced long-lived metastable states in Xn[Fe(CN)5NO] with inorganic and organic cations: Xn [Elektronische Daten] Pb, (H3O+CH6N+), (C2N2H7)2 and (C16H36N)2 [Theo Woike, Slimane Dahaoui, Dominik Schaniel, Simeon Ponou, Niels K. Hansen, Václav Petricek] The crystal structures of four compounds Xn[Fe(CN)5NO] with the different inorganic and organic cations Xn = Pb, (H3O+CH6N+), (C2N2H7)2 and (C16H36N)2 were determined. (H3O+CH6N+)[Fe(CN)5NO] and (C2N2H7)2[Fe(CN)5NO] crystallize in the non-centrosymmetric space groups Cmc21 and Pca21, respectively. Two metastable states can be excited by irradiation with light in each of these two compounds. Pb[Fe(CN)5NO] and (C16H36N)2[Fe(CN)5NO] crystallize in the centrosymmetric space groups Pnma and P21/n, respectively, but only one metastable state can be obtained at 110 K. In (H3O+CH6N+)[Fe(CN)5NO] and (C2N2H7)2[Fe(CN)5NO] the cations are disordered. The disorder is produced by symmetry related hydrogen bonds. The hydrogen bonds are established for all organic cations, but they are weak in (C16H36N)2[Fe(CN)5NO]. The donor-acceptor relation is fulfilled between the hydrogen atoms of the cations and the nitrogen atoms of the cyanide ligands. The light-induced metastable states, created by irradiation with light in the spectral range Δλ = 410-500 nm at 110 K, were investigated by Differential Scanning Calorimetry. The isothermal measurements show that the decay of the metastable states is purely exponential. From the dynamical measurements of heat flow versus temperature the activations energies and frequency factors of the metastable states are obtained. © 2004 Oldenbourg Wissenschaftsverlag GmbH Crystallography nationallicence Inorganic chemistry nationallicence Organic chemistry nationallicence Woike Theo aut Dahaoui Slimane aut Schaniel Dominik aut Ponou Simeon aut Hansen Niels K. aut Petricek Václav aut Zeitschrift für Kristallographie - Crystalline Materials De Gruyter Oldenbourg 219/9(2004-09-01), 558-566 2194-4946 219:9<558 2004 219 zkri https://doi.org/10.1524/zkri.219.9.558.44035 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/zkri.219.9.558.44035 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Woike Theo aut NATIONALLICENCE 700 1- Dahaoui Slimane aut NATIONALLICENCE 700 1- Schaniel Dominik aut NATIONALLICENCE 700 1- Ponou Simeon aut NATIONALLICENCE 700 1- Hansen Niels K. aut NATIONALLICENCE 700 1- Petricek Václav aut NATIONALLICENCE 773 0- Zeitschrift für Kristallographie - Crystalline Materials De Gruyter Oldenbourg 219/9(2004-09-01), 558-566 2194-4946 219:9<558 2004 219 zkri CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter