TY - JOUR
T1 - Negative thermal expansion in LnCo(CN)6 (Ln=La, Pr, Sm, Ho, Lu, Y)
T2 - Mechanisms and compositional trends
AU - Duyker, Samuel G.
AU - Peterson, Vanessa K.
AU - Kearley, Gordon J.
AU - Ramirez-Cuesta, Anibal J.
AU - Kepert, Cameron J.
PY - 2013/5/10
Y1 - 2013/5/10
N2 - RUM with a twist: The magnitude of negative thermal expansion (NTE) in the LnCo(CN)6 coordination frameworks increases with Ln ion radius r Ln. The framework structure contains an unusual locally unstable trigonal prismatic LnN6 unit that participates in an NTE-contributing vibrational mode by twisting about its axis at low energies. This contrasts with the rigid unit modes (RUMs) prevalent in other systems.
AB - RUM with a twist: The magnitude of negative thermal expansion (NTE) in the LnCo(CN)6 coordination frameworks increases with Ln ion radius r Ln. The framework structure contains an unusual locally unstable trigonal prismatic LnN6 unit that participates in an NTE-contributing vibrational mode by twisting about its axis at low energies. This contrasts with the rigid unit modes (RUMs) prevalent in other systems.
KW - coordination frameworks
KW - inelastic neutron scattering
KW - lanthanoids
KW - metal cyanides
KW - rigid unit mode
UR - http://www.scopus.com/inward/record.url?scp=84877299103&partnerID=8YFLogxK
U2 - 10.1002/anie.201300619
DO - 10.1002/anie.201300619
M3 - Article
AN - SCOPUS:84877299103
SN - 1433-7851
VL - 52
SP - 5266
EP - 5270
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 20
ER -