(4, 5)-Connected 3D Supramolecular Framework Based on 1D Tube-Shaped Coordination Armed-Chains [Mn(4,4′-bipy)(OAc)₂]_n

Abstract

A novel manganese(II) compound, namely, [Mn(4,4′-bipy)(OAc)₂] _n (1) (4,4′-bipy = 4,4′-bipyridine), has been hydrothermally synthesized and characterized. Single crystal X-ray diffraction reveals that it crystallizes in triclinic, P_ space group with a = 8.043 (4) Å, b = 9.319 (5) Å, c = 10.769 (6) Å, α = 109.342 (5)°, β = 99.823 (7)°, γ = 101.808 (7), V = 720.2(7) ų, C₂₄H₁₄MnN₂O₄, Mr = 329.21, Dc = 1.518 g·cm⁻³, Z = 1, F(000) = 338, the final R = 0.0485 and wR = 0.1028 for 3754 observed reflections [I > 2σ]. In 1, the cyclic dimeric metal acetate secondary building units are linked through 4,4′-bipyridine to yield 1D tube-shaped infinite armed-chains, which are further extended to a 3D supramolecular network with (4,5)-connected (4⁴·6²)(4⁴6⁵·8) topology through R₂ ¹(5) and R₂ ¹(7) C─H─O hydrogen bonds. Variable-temperature magnetic susceptibility measurements indicate weak antiferromagnetic exchange interactions between adjacent Mn^{2 +} centers.

Keywords:

• coordination chain
• hydrogen bonds
• magnetic property
• network topology

This project was supported by the National Natural Science Foundation of China (20773104), the Program for New Century Excellent Talents in University (NCET-06-0891), the Natural Science Foundation of Hubei/Shaanxi Provinces of China (2008CDB030, SJ08B11), the Key Project of Key Laboratory of Shaanxi Province (08JZ81), and the Important Project of Hubei Provincial Education Office (2009HB33).