Аннотация:Purple crystals of ethylenediammonium cobalt bis(hydrogen phosphite) dichloride were produced from an aqueous solution containing ethylenediamine, cobalt chloride, and phosphorous acid. The new compound is monoclinic, P21/c, a = 8.6665(3) Å, b = 7.2866(2) Å, c = 9.7300(3) Å, β = 112.726(3); V = 566.74(3) Å3, Z = 2. The 2D structure comprised ethylenediammonium cations sandwiched between the [Co(HPHO3)2Cl2]2− layers. The latter are built of trans-CoO4Cl2 octahedra linked by hydrogen-bonded dimers of hydrophosphite ions, (HPHO3)2(2−). The new compound is a complete structural analog of the recently reported (C2N2H10)[Co(HSeO3)2Cl2] and isostructural analogs with other transition metal dications; it is, in fact,the first representative of a new “layered hydrophosphite” family. Its structure provides yet another illustration of essentialsimilarities in the crystal chemistry of selenites and phosphites, including protonated species, wherein the lone pair of SeIVand the nearly nonpolar P–H enhance formation of loose and/or open-framework structural architectures.
