The Crystal and Molecular Structure of [Co(NH₃)₅PO₄]⁻3H₂O, a Na⁺-K⁺ ATPase Probe
The title compound, Co(NH3)5PO4, prepared by a modified literature procedure, was used to study the inhibition of Na+-K+ ATPase and to serve as a structural model for ML4(nucleotide) complexes. The structure was determined by single crystal X-ray diffraction techniques. The crystals are monoclinic, space group P21/n, a = 8.638(3), b = 14.517(2), c = 9.145(2) Å, and β = 112.71(2)°. The structure, solved by the heavy atom method to an R value of 3.3% for 1924 reflections, consists of a slightly distorted octahedron with the cobalt bound to the five amines and a monodentate phosphate. Solution structural data is taken from 31P NMR measurements. From comparison with other metal phosphate complexes it is concluded that multiple monodentate coordination of a di- or triphosphate closely resembles the coordination of a monophosphate This is based on the similarity of the MO bond angle which is 129.6° in the present example. © 1984.
G. A. Brewer et al., "The Crystal and Molecular Structure of [Co(NH₃)₅PO₄]⁻3H₂O, a Na⁺-K⁺ ATPase Probe," Inorganica Chimica Acta, Elsevier, Jan 1984.
The definitive version is available at http://dx.doi.org/10.1016/S0020-1693(00)82441-X
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