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The new polyoxometalate double-supporting transition metal complexes, {[Co(phen) 2 ] 2 C 2 O 4 } {H 2 P O 44 [Co(phen) 2 H 2 O] 2 }·7H 2 O (1) (phen  =  1,10-phenanthroline) have been hydrothermally synthesized and characterized by single crystal X-ray analysis, IR, XPS, ESR and elemental analysis. Compound 1 is composed of a highly reduced tetra-capped pseudo-Keggin polyoxoanion supporting two transition metal complexes, a binuclear cobalt complex cation and lattice water. The magnetism and third-order non-linear optical properties of 1 have also been studied. [ABSTRACT FROM AUTHOR]

Reaction of K 3 [Fe(CN) 6 ], NiCl 2 and diethylenetriamine (dien) resulted in the formation of a cyanide-containing heterometallic compound [Ni(dien) 2 ] 2 [Fe(CN) 6 ]·4H 2 O 1 . The structure consists of two octahedral [Ni(dien) 2 ] 2+ cations, one octahedral [Fe(CN) 6 ] 4- anion and four crystallization water molecules, which are held together by hydrogen-bonding interactions. Its TG curve exhibits two stages of mass loss. Compound 1 in DMF solutions has a very strong third-order non-linear optical (NLO) behavior with an absorption coefficient and refractive index α 2 = 1.10 × 10 -11 m w -1 , n 2 = -3.05 × 10 -19 m 2 w -1 , respectively, and third-order NLO susceptibility χ (3) 4.34 × 10 -13 esu. [ABSTRACT FROM AUTHOR]