380152-22-7Relevant academic research and scientific papers
Structurally adaptive multitopic ligands containing tris(pyrazolyl)methane units as supramolecular synthons: Manganese carbonyl complexes
Reger, Daniel L.,Semeniuc, Radu F.,Smith, Mark D.
, p. 87 - 101 (2003)
The compounds {p-C6H4[CH2OCH2 C(pz)3]2- [Mn(CO)3]2} (OTf)2 (2, OTf- = CF3 SO3-), {m-C6H4 [CH2OCH2C(pz)3] 2[Mn(CO)3]2}(BF4)2 (3) and {1,2,4,5-C6H2[CH2OCH2 C-(pz)3]4[Mn(CO)3]4} (BF4)4 (4) have been prepared by reaction of the respective ligands with 'Mn (CO)5+,, prepared 'in situ' from the reaction of Mn(CO)5Br and AgBF4 or AgOTf in refluxing acetone. In the structures of all four complexes, the environment around the manganese atom is a slightly distorted octahedron, with the distortion caused by the restricted bite angle of the κ3-bonded tris(pyrazolyl)methane ligand. The structurally adaptive ligands in all four complexes support extended three-dimensional (3D) supramolecular structures. An important organizational feature for the three BF4- complexes is a double π-π and C-H?π interaction involving the pyrazolyl rings. The double π-π/-H?π interaction is intermolecular in 1 and 3 leading to the formation of chains and sheets. In the case of the tetratopic ligand in complex 4, the π-π/C-H?π interaction is intramolecular between adjacent (ortho) side arms. These supramolecular structures are also supported by weak C-H?F hydrogen bonds. For 3, classic π-π interactions of the central arene rings are also involved in organizing the 3D network. For 2, the structure is organized solely by C-H?O hydrogen bonding.
