Fourier transform infrared and Raman spectra of manganese hydrogenphosphate trihydrate

The FTIR spectra of MnHPO4. 3H(2)O and a series of deuterated analogues and the Raman spectrum of the protiated compound were recorded and analyzed. T he O-H stretchings of the HPO42- ions give rise to a complex feature (the A ,B,C trio) of which only the two former components are clearly visible, the third component (C) possibly contributing to the breath of the bands in th e H-O-H bending region and/or the appearance of multiple bands in this regi on. The P-O-H in-plane bending can be identified with certainty, whereas th e assignment of the P-O-H out-of-plane bending is somewhat tentative. The s pectrum of water in the stretching region is simpler than expected. Only tw o bands of considerable intensity are observed in the delta(HOH) region, al though three different types of water molecules are present in the structur e. (C) 1999 Elsevier Science B.V. All rights reserved.