Influence of 2‐Aminopyridine on the Formation of Molybdates under Hydrothermal Conditions

Abstract

Abstract The hydrothermal reaction of an aqueous ammonium heptamolybdate solution with first‐row transition metal salts in the presence of 2‐aminopyridine at around 180 °C and under autogenous pressure yields several molybdates, such as the 1D chains in (C 5 N 2 H 7 ) 4 Mo 8 O 26 ( 1 ), zero‐dimensional (C 5 N 2 H 7 ) 6 Mo 7 O 24 · 3H 2 O ( 2 ), and the first synthesis of Lindgrenite [Cu 3 Mo 2 O 8 (OH) 2 ( 3 )] The structures of these materials were established by single‐crystal and powder X‐ray diffraction techniques. The crystal structures of wolframite‐based MnMoO 4 ( 4 ) and ZnMoO 4 ( 5 ) were established by powder X‐ray diffraction. The role of 2‐aminopyridine (2‐ampy) in the formation of the different solids under hydrothermal conditions is discussed. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)