Detection of a second Br site in K2Pt(CN)4Br0.3 3.2 H2O (KCP) by 18Br and 39K NMR

Abstract By nuclear magnetic resonance we have detected between 20 and 300 K two bromine signals with a temperature-independent intensity ratio of 2.5 ± 0.3 proving the existence of a second Br site in KCP. The result is supported by the observation of three potassium signals. Thus, three types of unit cells exist: 40% contain defect water, 43% have Br in site I and 17% Br in site II.