A Meso Cobalt (II) Complex Derived from Cobalt (II) Salt and N‐ (2‐pyridyliene)‐2‐pyrimidylamine: Synthesis and Characterization

A meso cobalt(II) complex, [Co(II) L2L2′] · 4.25H₂O, has been synthesized from heterocyclic Schiff‐base ligand N‐ (2‐pyridyliene)‐2‐pyrimidylamine (L1) with inorganic cobalt(II) Salt, and its coordination of chemistry has also been investigated. Carmine block crystals of [Co(II) L2 L2′] · 4.25H₂O were obtained from the filtrate which was resulted from the addition of a hot alcohol solution of N‐ (2‐pyridyliene)‐2‐pyrimidylamine (L1) into the alcohol solution of the CoCl₂ · 6H₂O. Single‐crystal X‐ray diffraction analysis indicates that it crystallizes in a trigonal system with space group R‐3c, with a=24.820(4), b=24.820(4), c=21.010(4) Å, α=90°, β=90°, γ=120°, V=11209(3) ų, Z=36, Mr=533.413, F(000)=5060, D_c=1.439 g/cm³, μ(MoKα)=0.742 mm⁻¹, R=0.0666, and wR2=0.2734 for 2229 reflections with I>2σ (I). The Co atom is coordinated in a elongated octahedral geometry by two O atoms, which produced by partial hydrolysis of N‐ (2‐pyridyliene)‐2‐pyrimidylamine (L1), and four N atoms, among which two N atoms were from pyridyl units, and the other two N atoms were from two pyrimidyl units. The X‐ray structure exhibited π‐π interaction. A unique partial hydrolysis of N‐ (2‐pyridyliene)‐2‐pyrimidylamine (L1), followed by deprotonization was observed in the coordination process.

Keywords:

• crystal structure
• cobalt(II) complex
• Schiff Base
• synthesis

This work was supported by the Hubei Provincial Natural Science Foundation under the grant No. 2004 ABA111, and supported by the Group of Young Scientist Innovation Foundation of Hubei Province under the Grant No. 2004T006