Bond angles anion ligands

Alkyl halides, hydroperoxide synthesis, 327-8 Alkyl hydroperoxides anion ligands, 114-19 covalent radii, 114, 118-19 dihedral angles, 119 geometric parameters, 115-8 tetrahedral distortion, 119 artemisinin formation, 133-4 chlorotriorganosilane reactions, 779-83 crystal structure, 105-14 anomeric effect, 110-11 geometric parameters, 106-9 hydrogen bonding, 103-5, 111-14 tetrahedral distortion, 110 determination, 674... 

In most known bis-dithiolenes, the ligands form the strictly square planar arrangement indicated in (5), with all S—M—S bond angles very close to 90°. The planar geometry is also found in the majority of mono- and di-anions of these species, but here the dihedral angle between the two ligands can vary up to the tetrahedral extreme (see, for example, Section 16.5.2.5). Depending on the central metal, the neutral bis-dithiolenes may exist as planar monomers or form dimers with either metal-metal bonds, as shown in (6), or with metal-sulfur bonds as, for example, the dithiolene... 

The corresponding Tc-N-C bond angles of 128.3(4)°, 126.6(4)°, and 129.1(4)°, however, seem to offer little distinction between neutral and anionic nitrogen. Cationic complexes of the type [TcC12L]+ have been prepared by the reaction of [TcCl4(PPh3)2] with the tetradentate ligands (27) (310). 

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