Magnetic moments and Electronic spectra of the Co(II), Ni(II) and Cu(II) complexes indicate that the geometries of the metal centers are octahedral
1] and can be assigned to Ti-O stretching vibrations of Ti atoms in octahedral
(near 600 [cm.
It has similarity with spinel ferrite (structure) with the fact that both possess same ratio of octahedral
and tetrahedral sites.
In all four polymorphs, titanium is coordinated octahedral
by oxygen, but the position of octahedral
differs between polymorphs.
The inclusions partly showed an octahedral
habit, and analysis with a Zeiss DSM 942 scanning electron microscope at the Institute for Gemstone Research, University of Mainz, Germany, identified them as pyrochlore, [(Ca, Na).
3+] occupy the octahedral
holes in a brucite-like layer and the anion [A.
Two types of octahedral
sheets occur in clay minerals: dioctahedral, where two-thirds of the octahedral
sites are occupied by trivalent cations, such as [Al.
1] result from bending and deformation vibrations in octahedral
The complexes of acetovaleric acid hydrazone [AVAH], acetylaldehyde valeric acid hydrazone [AAVAH], acetyl isovaleric acid hydrazone [AIVA] and acety aldehyde varaleric acid hydrazone [AAIVAH] complexes with Cu(II) and Ni(II) sulphate have been reported to be of distorted octahedral
symmetry with a promising antibacterial activity (4).
Spectra confirm octahedral
configuration for Co (II) complex and tetrahedral configuration for Ni (II) complex .
Each layer is formed of tetrahedrally coordinated Si atoms fused into an edge-sharing octahedral
plane of either alumina or magnesia (4).
, pink to rose-red fluorite crystals are historically among the most treasured and sought after of all Alpine minerals.