Hydrolysis of ternary carbides of manganese Mn3MC (M = Al, Ga, In, Sn)

Perovskite type ternary carbides of manganese Mn3MC (M = Al, Ga, In, Sn) are hydrolyzable by acids, water and air moisture. Mn3AlC is hydrolyzed most readily; its linear corrosion rate with liquid water is 0.3 μm h-1 at 60 °C, whereas the value for Mn3GaC is 0.06 μm h-1. The reactivity decreases with increasing nobleness of the nontransition metal involved. The hydrolysis process gives rise to a mixture of hydrogen and methane and a low amount of higher saturated and unsaturated hydrocarbons whose fractions are consistent with the concept of the radical mechanism of the hydrolysis reaction.

Synthesis, structure, proton-nuclear magnetic resonance, and Fourier transform infrared spectroscopy of several transition and nontransition metal–adenosine-5-triphosphate complexes

Several complexes of adenosine-5-triphosphate disodium salt (Na2H2ATP) with the metal ions, Na+, Mg2+, Ca2+, Mn2+, Co2+, Ni2+, Cu2+, and cis- and trans-Pt(NH3)2Cl2 and K2PtCl4 at pH = 3.5 and 7.2 have been isolated, identified, and studied. Marked spectral similarities have been observed for the structurally known metal–phosphate bonded compounds, [Cu(H2ATP)(phen)]2•7H2O and [Zn(H2ATP)(bipy)]2•4H2O and all the metal–ATP complexes studied here, except the Pt–ATP complexes. The metal binding is through the α, β, and γ phosphate oxygen atoms when the N1-position of adenine is protonated. Spectral changes have also been observed for the Pt–ATP complexes in which there is a Pt–N7 and –N1 coordination. The sugar pucker in the Na2H2ATP•3H2O crystal dimers is C3′-endo–anti (in one) and C2′-endo–anti (in the other) with a characteristic infrared band at 818 cm−1. In the corresponding Cu2+ and Zn2+ complexes the sugar has C3′-endo–anti conformation with the marker band at about 814 cm−1. The C2′-endo–anti conformation is observed for all the metal–ATP complexes prepared here with a marker band at 825–822 cm−1.