The synthesis, crystal structure, redox characteristics and photochemistry of a new heptamolybdate supported magnesium-aqua coordination complex viz. (hmtH) 2 [{Mg(H 2 O) 5 } 2 {Mo 7 O 24 }]•3H 2 O 1 (hmt = hexamethylenetetramine) is reported. The cyclic voltammogram reveals quasireversible redox behaviour while the degradation of rhodamine B (RhB) by 1 under sunlight irradiation indicates its photocatalytic activity. In the crystal structure of 1,t w o[ M g (H 2 O) 5 ] 2+ units are linked by a µ 2-bridging bidentate heptamolybdate ligand resulting in a heptamolybdate supported magnesium-aqua coordinated dianionic complex [{Mg(H 2 O) 5 } 2 {Mo 7 O 24 }] 2− charge balanced by two (hmtH) + cations. The cations, anions and the lattice water molecules are linked by several hydrogen bonding interactions.
The synthesis, crystal structure, spectral characterization, photochemistry, electrochemical and thermal studies of the hexakis(butan-1-aminium) heptamolybdate(VI) tetrahydrate (1) are reported. Dissolution of a mixed mono-hepta compound (BuNH 3) 8 [(Mo 7 O 24)(MoO 4)]•3H 2 O in water results in its transformation to the title compound viz., (BuNH 3) 6 [Mo 7 O 24 ]•4H 2 O 1 (BuNH 3 = butan-1-aminium). The structure of the title compound consists of two crystallographically unique [Mo 7 O 24 ] 6− anions, twelve independent (BuNH 3) + cations and eight unique lattice water molecules, all of which are interlinked with the aid of three varieties of Hbonding interactions. Solar irradiation of 1 results in the formation of a bis(μ 2-oxo) bridged diheptamolybdate product. Electrochemical studies reveal the role of 1 in the photodimerization process. Thermal decomposition of 1 results in the formation of crystalline α-MoO 3 .
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