Synthesis and crystal structure of nickel and cobalt complexes with tetraazamacrocyclic ligand attached four dangling pyridinyl groups

The reaction of 1,4,8,11-tetrakis(3-hydroxy-6-methyl-2-pyridylmethyl)-1,4,8,11- tetraazacyclotetradecane with nickel and cobalt nitrate in methanol at 1:1 molar ratio afforded two new crystals. Both of them are isotructural analogues. Nickel complex crystallized in triclinic space group P-1 with a=10.050(3), b=12.599(4), c=18.267(6) Å, α=109.595(3)°, β=103.829(7)°, γ=93.376(6)°, V=2091.2(12) Å 3, and Z=2. The Ni(II) ions are five-coordinated by four nitrogen atoms and one phenolic oxygen atom. Their coordination geometry can be described as square pyramid, with short Ni–O distance.(1.984(3)Å) Cobalt complex crystallized in triclinic space group P-1 with a=9.9479(9), b=12.4441(11), c=18.2620(16) Å, α=108.0730(10)°, β=104.5780(10)°, γ=93.2030(10)°, V=2057.8(3) Å3, and Z=4. The Co(II) ions are also five-coordinated by similar atoms as found in copper complex.