Abstract
High-temperature sequential powder diffractometry has revealed a phase transformation in monoclinic copper hydroxide nitrate Cu2(OH)3(NO3) occurring at 158°C. It is connected with a small endothermic effect of 0.5 KJ mole-1. The high-temperature phase is monoclinic with the unit cell dimensions a = 5.6132(7), b = 6.0986(8), c = 6.9560(9) Å, and β = 92.35(1)°; the space group is P21 with Z = 2. The crystal structure of this new phase has been determined from X-ray and neutron powder diffraction data collected at 160°C. The structure is built from wavy layers of brucite type, linked together by hydrogen bonds, as in the room-temperature phase. The main differences between the two phases are a slight reorientation of the nitrate group and some changes occurring in hydrogen bonds.
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