The crystal structure of bis(m ₂ -2-((dimethylamino)methyl)-6-ethoxyphenolato-k ³ O:O,N)-bis(m ₂ -2-((dimethylamino)methyl)-6-ethoxyphenolato-k ³ O,O′,N) bis(m ₂ -azido-k ² N:N)-bis(azido-k ¹ N)tetracobalt(II), C ₄₄ H ₆₄ Co ₄ N ₁₆ O ₈