Hydrothermal crystallisation of metal (II) orotates (M=nickel, cobalt, manganese or zinc). Effect of 2,2-bipyridyl, 2,2-dipyridyl amine, 1-methyl-3-(2-pyridyl)pyrazole, phenanthroline and 2,9-dimethyl-1,10-phenanthroline upon structure

Abstract Hydrothermal synthesis of orotic acid (H 3 L) with Ni(OAc) 2 ·4H 2 O gives a green 1D co-ordinative network of composition [Ni(HL)(H 2 O) 3 ] ( 3 ). The kinetic product [Ni(HL)·(H 2 O) 4 ]H 2 O ( 4 ) can be prepared by conventional crystallisation. When boiled in water it is transformed into the thermodynamically favoured trihydrate 3 . An unstable blue phase 5 that could not be characterised was also observed. Hydrothermal synthesis of orotic acid and M(OAc) 2 · 4H 2 O (M=Ni, Co, Mn or Zn) and either 2,2-bipyridyl (bipy), 2,2-dipyridylamine (dpa), phenanthroline (phen), methyl-3-(2-pyridyl)pyrazole (pypz) or 2,9-dimethyl-1,10-phenanthroline (dmphen) gave infinite 1D co-ordinative networks of composition [M(HL)bipy(H 2 O)] (M=Co or Mn) ( 6 – 7 ) and complexes of composition [Ni(HL)bipy (H 2 O) 2 ]2H 2 O ( 8 ); [Ni(HL)(dpa)(H 2 O) 2 ]H 2 O ( 9 ); [Ni(HL)(phen)(H 2 O) 2 ]·2H 2 O ( 10 ); [Ni(HL)(C 9 H 9 N 3 )(H 2 O) 2 ]·2H 2 O ( 11 ); [Ni(HL)(dmphen)(H 2 O)] ( 12 ); [Zn(HL)bipy(H 2 O)] ( 13 ) and [Ni(HL)(dpa) 2 ]·0.5H 2 O ( 14 ).