Coordination polymers of 5-substituted 1,2,3,4-tetracyanocyclopentadienides: structural and electrochemical properties of complex compounds of 5-amino- and 5-nitro-tetracyanocyclopentadienide.

Compounds of the 5 amino (ATCC) and 5 nitro 1,2,3,4 tetracyanocyclopentadienide (NTCC) ligand with iron(II) and iron(III), silver(I) and potassium(I) were prepared and characterized by electrochemical methods using EPR, cyclic voltammetry and Mößbauer spectroscopy as well as UV-Vis spectroscopy. The investigation sheds light on the free radical activity in non- as well as transition metal compounds, and shows signs of photoinduced electron transfer in transition metal compounds of the ligands. We characterized silver(I) and potassium compounds of the compounds X-ray diffraction, with one of the structures exhibiting a porous coordination polymer.

Correction: Structural diversity in the alkaline earth metal compounds of tetra and pentacyanocyclopentadienide.

Correction for 'Structural diversity in the alkaline earth metal compounds of tetra and pentacyanocyclopentadienide' by Karlheinz Sünkel et al., Dalton Trans., 2018, 47, 409-417.

Structural diversity in the alkaline earth metal compounds of tetra and pentacyanocyclopentadienide.

The reaction of the alkaline earth dihalides MCl·nHO (M = Mg, Ca, Sr, Ba) with the silver salts of cyanocyclopentadienides [C(CN)X] (X = H, CN) yields the corresponding alkaline earth biscyclopentadienides. The pentacyanocyclopentadienides of Mg and Ca and the tetracyanocyclopentadienides of Ca, Sr and Ba were studied by X-ray diffraction. The Mg compound 1a' shows only coordination by water molecules, but numerous hydrogen bridges between coordinated water molecules and pentacyanocyclopentadienide anions and further guest water molecules create a three-dimensional network.