TY - JOUR
T1 - Structural and Spectroscopic Studies of Transition Metal Nitrite Complexes. VII Crystal Structures and Spectra of Two Dinuclear and Trinuclear Species with Stoichiometry [Ni(methylpyridine)2(NO2)2] Containing Bridging Nitrite Groups
AU - Finney, Anthony J.
AU - Hitchman, Michael A.
AU - Raston, Colin L.
AU - Rowbottom, Graham L.
AU - White, Allan H.
PY - 1981
Y1 - 1981
N2 - The crystal structures of the dimer [Ni(γmpy)2(NO2)2]2, 2C6H6 and the trimer [Ni(βlmpy)2(NO2)2]3,-C6Hs (γmpy = 4-methylpyridine, βmpy = 3-methylpyridine) are reported, the latter being the redetermination of a structure described previously. The ligand coordination geometry in each oligomer is essentially octahedral, with neighbouring nickel(II) ions being bridged by two nitrite groups, one through a single oxygen atom and the second through an oxygen and the nitrogen atom. The amine ligands occupy trans coordination sites with the terminal bond positions in both species being taken up by chelating nitrite ions. In both compounds the oligomers pack so that the amine rings form sheets with potential voids in the lattice being filled by clathrated benzene molecules. The electronic spectra of the complexes in the VIsible region are unusual, showing peaks centred at c. 17500 and c. 20500 cm-1, and the assignment of these is discussed. The infrared stretching frequencies of the nitrite groups in these and other compounds are found to correlate well with the observed nitrogen-oxygen bond lengths.
AB - The crystal structures of the dimer [Ni(γmpy)2(NO2)2]2, 2C6H6 and the trimer [Ni(βlmpy)2(NO2)2]3,-C6Hs (γmpy = 4-methylpyridine, βmpy = 3-methylpyridine) are reported, the latter being the redetermination of a structure described previously. The ligand coordination geometry in each oligomer is essentially octahedral, with neighbouring nickel(II) ions being bridged by two nitrite groups, one through a single oxygen atom and the second through an oxygen and the nitrogen atom. The amine ligands occupy trans coordination sites with the terminal bond positions in both species being taken up by chelating nitrite ions. In both compounds the oligomers pack so that the amine rings form sheets with potential voids in the lattice being filled by clathrated benzene molecules. The electronic spectra of the complexes in the VIsible region are unusual, showing peaks centred at c. 17500 and c. 20500 cm-1, and the assignment of these is discussed. The infrared stretching frequencies of the nitrite groups in these and other compounds are found to correlate well with the observed nitrogen-oxygen bond lengths.
UR - http://www.scopus.com/inward/record.url?scp=0008142894&partnerID=8YFLogxK
U2 - 10.1071/CH9812125
DO - 10.1071/CH9812125
M3 - Article
AN - SCOPUS:0008142894
SN - 0004-9425
VL - 34
SP - 2125
EP - 2138
JO - Australian Journal of Chemistry
JF - Australian Journal of Chemistry
IS - 10
ER -