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Polynuclear coordination precursors compounds for M3Fe5O12 garnets (M=Y, Eu, Gd and Er), Part I: Synthesis of the precursors

Patron Luminita (Coordination Chemistry Laboratory, Institute of Physical Chemistry, Bucharest, Romania)
Carp Oana (Coordination Chemistry Laboratory, Institute of Physical Chemistry, Bucharest, Romania)
Mindru Ioana (Coordination Chemistry Laboratory, Institute of Physical Chemistry, Bucharest, Romania)
Marinescu Gabriela (Coordination Chemistry Laboratory, Institute of Physical Chemistry, Bucharest, Romania)
Stanica Nicolae (Coordination Chemistry Laboratory, Institute of Physical Chemistry, Bucharest, Romania)
Balint Ioan (Coordination Chemistry Laboratory, Institute of Physical Chemistry, Bucharest, Romania and Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, Japan)

Anew type of complexes compounds (NH4)6[M3Fe5(C4O5H4)6(C4O5H3)6]. 16H2O (where M(III) = Y, Eu, Gd, Er), (NH4)6[M3Fe5(C4O6H4)6(C4O6H3)6]. 16H2O (where M(III) = Gd, Er) and (NH4)6[M3Fe5(C6O7H10)6(C6O7H9)6]. xH2O (where M(III) = Y; x = 8; M(III) = Eu, Er; x = 22) [C4O5H4 2– = malate anion C4O6H42– = tartarate anion, C6O7H11 – = gluconate anion_ have been synthesized and characterised by elemental chemical analysis and physico-chemical measurements (IR, UV-Vis spectroscopy and magnetic determinations). The synthetic possibilities offered by the use of these new compounds as potential precursors for garnets have been suggested.

Keywords: garnets precursors, complexation method