Synthesis and crystal structure of nickel(0) dicarbonyl complex with 4-amino-3,5-di-2-pyridyl-4H-1,2,4-triazole. [Ni(adpt)(CO)_2]_2・(adpt)_2(thf)

概要

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A nickel(0) dicarbonyl complex [Ni(adpt)(CO)_2]_2・(adpt)_2(thf) (1) (adpt=4-amino-3,5-di-2-pyridyl-4H-1,2,4-triazole) has been prepared and has been characterized crystallographically. Complex 1 has atriclinic, space group P1, a=l 1.473(6), b=15.779(3), c=8.179(1)Å, α=101.29(1), β=94.70(3), γ=102.87(3)°, V=1403.3(9)Å, Z=1, R=0.036 and R_w=0.037. There includes two crystallographically different dicarbonyl nickel(0) complexes [Ni(adpt)(CO)_2] (1a and 1b), two free adpt ligands and one solvated thf in a unit cell. On both complexes each Ni atom is coordinated by N atom from one side of two pyridyl groups in the coordinating adpt ligand, one N atom of triazole group and two terminal coordinating CO to provide the four-coordinate mononuclear structure in the distorted tetrahedral geometry. It was found that the Ni-CO bond is strengthened (shorter) and the C≡O bond is correspondingly weakened (longer), depending on the a donation from N donor atom in the trans position.
近畿大学の論文
1998-02-28