Possible arrangements of the ligands in a hexagonal planar complex of composition L L L L X X Z Z L X L L L L X L X Z X L L X L L Z X L L Possible arrangements of the ligands in a trigonal prismatic complex of composition X L L Z L L X L L L Z X L X Possible arrangements of the ligands in an octahedral complex of composition X X L X L L Z Z L L L L X L Possible arrangements of 6 ligands L around a central atom Z L L L Z L L L L L L L L L Z Z L L L L L L L L L Z L L L followed by first the anionic ligand and then the neutral ligands within each group they are alphabetically ordered according to the first character of their formula.first the name of the central atom is given.complexes are enclosed in square brackets.In some cases special names have to been used: aqua (H2O), ammine (NH3), carbonyl (CO), nitrosyl(NO) Examples: Potassiumtetrafluorooxochromate Tris(ethylendiamin)cobalt(III)sulfate Tetrakis(trifluorphosphin)nickel(0) Tetraammincopper(II)chloride For neutral or cationic ligands the name of the ligand is used and sometimes included in round brackets. The names of the ligands are used with an suffix -o if the ligand is an anion -chloro, -hydroxo, -thio, -oxo, -nitrato, carbonato etc. may be used for the central atom the following rules are used:in a neutral or cationic complex the name of the metal is used followed by an information on its oxidation statein an anionic complex the name of the metal is used plus an suffix -ate for some metals the latin name has to be used: -plumbate, -ferrate, -argentate, -cuprate, aurate etc. Rules for naming complexes first in the names of a complex the ligands are named in alphabetic order of the first character (there is no distinction between anionic and other ligands) followed by the name of the central atom the number of ligands is indicated by greek numerals: mono, di, tri, tetra, penta, hexa, hepta, octa, nona, deca if necessary bis, tris, tetrakis, pentakis etc. The number of ligands around a central atom is called the “coordination number”. E N D - Presentation TranscriptĮlectronic configuration of the 3d transition elements Sc Ti V Cr Mn Fe Co Ni Cu Zn 4s 2 2 2 1 2 2 2 2 1 2 3d 1 2 3 5 5 6 7 8 10 10 Electronic configuration of the Lanthanides Pm Er Sm Eu Gd Tb Dy Ho Yb Lu Hf Tm La Ce Pr Nd 2 012 2 010 2 011 2 013 2 0 4 205 2 2 2 2 2 2 2 6s 2 2 2 0 0 1 0 0 1 2 5d 1 1 0 6 7 7 9 14 14 14 4f 0 1 3ĭefinition: A complex or coordination compound is a compound in which an atom (called “central atom”) is bound to more groups (called “ligands”) than expected with respect to its charge and position in the periodic table.
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