The Crystal and Molecular Structures of 2,5-Bis(2'-pyridyl)-pyrazine (BPPZ) and Some 3d Transition-Metal Complexes
The symmetrical ligand 2,5-bis(2'-pyridyl)pyrazine (BPPZ) exists in the extended form with a dihedral angle between the pyrazine and the pyridine rings of 7.88°. BPPZ forms symmetrical bis(bidenate) complexes with MnII, FeII, and CuII. The dihedral angles between the best planes through the planar pyrazine ring and the pyridine ring are 2.6° in the MnII complex, 4° in the FeII complex, and 8.5° in the CuII complex. The metal-Npy bond distances are shorter than standard values and similar in length to the metal-Npz distances.
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