Co-ordination

Also an atom, molecule, or ion that is electron deficient and which can form a co-ordinate link with an electron donor. Thus in the complex ion [Co(NH3)eP the cobalt(Ill) ion is an acceptor and the ammonia the electron donor. t-acceptors are molecules or atoms which accept electrons into n, p or d orbitals. 

Berlin green, FeFe(CN)mechanism postulated for the interchange of substituents in trigonal-bipyramidal 5-co-ordinate complexes, e g. PF, and its substituted derivatives. berthoUide compound Solid phases showing a range of composition. 

The chemistry of Be is largely that of covalent species although ionic oxygen-co-ordinated species, e.g. [Be(H20>4]2 [Be3(OH)3p are... 

An unstable lower oxidation stale is found in Cd - CdCl and Cd - CdCl - AICI3 melts and may contain Cd — Cd bonds. The common co-ordination number for Cd is 6 (octahedral) although 4 and 5 co-ordination are known. 

CoS04,7H20. Few cobalt(III) oxy acid salts are known. 002(504)3,ISHjO is formed by electrolytic oxidation and forms alums Co(N03)3 contains co-ordinated nitrate (C0F3 plus NjOs). 

Copper(II) salts (blue in aqueous solution) are typical M(II) salts but generally have a distorted co-ordination (Jahn-Teller distortion, 4 near plus 2 far neighbours). Extensive ranges of complexes are known, particularly with /V-ligands. 

DNOC See 4,6-dinitro-o-cresol. dodecahedral co-ordination Co-ordination by... 

Complexes. These derivatives contain complex anions which may be considered as derived from co-ordination of an H" ion to a metal or non-metal. Examples are the BH4" and ReHg " ions. 

---