Coordination geometry distorted trigonal bipyramidal

The crystal structure of a dimethylgallium salicylaldehyde complex shows it to be dimeric. There is a central Ga202 ring the Ga atoms are five-coordinate with distorted trigonal bipyramidal geometry.579... 

All the D4Rs in the structure have a fluoride ion incorporated in the centre. The D4Rs are distorted in such a way that the [ ion can approach all four Ga atoms at distances ranging from 2.30 to 2.66 A. The Ga atoms, in turn, become five-coordinated with distorted trigonal bipyramid coordination. The P—F distances are all greater than 2.78 A, and the P atoms retain the tetrahedral geometry. 

Diffusion of solutions containing zinc chloride and crown ethers can give solid state structure where the zinc ion is coordinated to the crown ether oxygens.718 A five-coordinate zinc is observed with distorted trigonal-bipyramidal geometry bound to a chloride, a water molecule,... 

A tridentate SNO ligand coordinates with a bipyridine to give ((2,2 -bipyridine)[2-(2-mercapto-phenyl)iminophenoxy])zinc. The monomeric complex has a distorted trigonal bipyramidal geometry with a phenolate and a thiolate coordinated. The synthesis was carried out electrochemically from anodic zinc in the presence of a disulfide-linked ligand precursor.867... 

Coordination about the osmium in 47 is best regarded as distorted trigonal bipyramidal with axial triphenylphosphine ligands. The distortion is toward a square pyramidal geometry with an apical nitrosyl ligand. Coordination about Os in the six-coordinate phenylcarbene complex is octahedral, as expected. 

For five-coordination, the usual geometry is trigonal bipyramidal. This varies from fully symmetrical, as in Pt SnF, to extremely distorted. At the limit the shape can equally well be described as capped tetrahedral or distorted square pyramid. 

The spironorbornyl cation 74 is best described as an intramolecular bisalkene complex of a plumbylium ion (see Fig. 10 and Table XIV). The Pb atom in cation 74 has a distorted trigonal-bipyramidal coordination geometry (Fig. 10b). The planarity of the trigonal base is indicated by summation of the three C-Pb-C angles... 

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