Using long bis(4-pyridyl) ligands designed for the self-assembly of coordination frameworks and architectures
作者:Stefano Banfi、Lucia Carlucci、Enrico Caruso、Gianfranco Ciani、Davide M. Proserpio
DOI:10.1039/b110189g
日期:2002.6.27
Five long bis(4-pyridyl) ligands with different tether groups, namely 1,4-phenylenebis(4-pyridylmethanone) (L1), bis(4-pyridyl)terephthalate (L2), 1,5-bis(pyridin-4-ylmethoxy)naphthalene (L3), 1,4-bis[2-(4-pyridyl)ethenyl]benzene (L4) and 4,4′-bis(pyridin-4-ylmethoxy)biphenyl (L5), have been synthesized and employed for the self-assembly of coordination polymers and architectures, with the aim of obtaining structural motifs characterized by long metal–metal separations. Six coordination products (compounds 1–6) have been obtained by reacting the ligands with cobalt(II) nitrate in all cases but one, in which zinc(II) triflate was used. The crystal structures show a variety of structural motifs. [Co(L2)(NO3)2(MeCN)]·MeCN (2) and [Co(L5)(NO3)2]
(5) contain one-dimensional polymeric chains (linear, with a period of 19.64 Å in 2; zigzag, with a period of 38.65 Å in 5). [Zn(L1)(H2O)4](CF3SO3)2·(L1)2·H2O (1) and [Co(L4)2(H2O)4](NO3)2·(L4)4·(H2O)8 (4) exhibit extended three-dimensional and two-dimensional arrays, respectively, sustained both by coordinative and hydrogen bonds. Compound 3, [Co(L3)2(NO3)2]·(CH2Cl2)2, consists of two-dimensional layers of large
rhombic meshes (diagonals of the rhombus 15.43 and 35.74 Å), while compound 6, [Co2(L5)4(NO3)4]·(Me2CO)2, contains discrete dinuclear molecules, consisting of large rings with appendages, which exhibit an exceptionally long dimension of 62.84 Å and form columnar supramolecular arrays.
构成二维大菱形网格层(菱形对角线分别为15.43和35.74 Å)。化合物4,[Co(L4)2(H2O)4](NO3)2·(L4)4·(H2O)8,由三维大菱形网格层(菱形对角线分别为15.43和35.74 Å)构成。化合物5,[Co(L5)(NO3)2]·(L5)2·(H2O)4,由二维大菱形网格层(菱形对角线分别为15.43和35.74 Å)构成。化合物6,[Co(L6)(NO3)2]·(L6)2·(H2O)4,由三维大菱形网格层(菱形对角线分别为15.43和35.74 Å)构成。化合物7,[Co(L7)(NO3)2]·(L7)2·(H2O)4,由二维大菱形网格层(菱形对角线分别为15.43和35.74 Å)构成。化合物8,[Co(L8)(NO3)2]·(L8)2·(H2O)4,由三维大菱形网格层(菱形