Conformational Flexibility of the Square-Pyramidal Coordination Cap in a Series of Octahedral Nickel(II) Pentaamine Complexes – Magnetochemical Characterization of the Singly μ-Cl-Bridged Nickel(II) Dimer [(pyN4)Ni-Cl-Ni(pyN4)](PF6)3 [pyN4 = 2,6-Bis(1′,3′-diamino-2′-methylprop-2′-yl)pyridine]
✍ Scribed by Christian Dietz; Frank W. Heinemann; Jörg Kuhnigk; Carl Krüger; Michael Gerdan; Alfred X. Trautwein; Andreas Grohmann
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 394 KB
- Volume
- 1998
- Category
- Article
- ISSN
- 1434-1948
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✦ Synopsis
The architecture of the tetrapodal pentaamine ligand 2,6-applicable), and X-ray structure determination. While the solid state structures show varying degrees of distortion of bis(1Ј,3Ј-diamino-2Ј-methylprop-2Ј-yl)pyridine (pyN 4 , 1) allows it to coordinate to nickel(II) as a square pyramidal the ligand cap 1 from C 2v symmetry, a polynucleating coordination mode has not been observed. The ligand coordination cap. The pyridine nitrogen atom occupies an apical position of the coordination octahedron, while four enables the synthesis of dinuclear nickel(II) complexes containing a single bridging ligand, as exemplified by the equivalent pendent primary amino groups occupy the equatorial positions, with a sixth coordination site remaining singly µ-chloro bridged complex [(1)Ni-Cl-Ni( )](PF 6 ) 3 . This complex has an antiferromagnetically coupled ground state for a monodentate ligand. Exchange of this ligand is facile, and a series of complexes [(1)NiX] n+ (X = OH 2 , OClO 3 , NCS, of total spin S T = 0, as determined from variable-temperature magnetic susceptibility measurements. N 3 , {Cl-Ni(pyN 4 )}) has been prepared and characterised by elemental analysis, IR and UV/Vis spectroscopies (as