Tetracoordinate

Tetracoordinate in coordination chemistry generally refers to four ligands or atomic attachments to a single metal centre. Tetracoordinate species can form tetrahedral, square planar or pyramidal geometries. This is usually dictated by lone electron pairs on the metal centre.

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Molecular geometry
Coordination number 2	Linear Bent
Coordination number 3	Trigonal planar Trigonal pyramidal T-shaped
Coordination number 4	Tetrahedral Square planar Seesaw
Coordination number 5	Trigonal bipyramidal Square pyramidal Pentagonal planar
Coordination number 6	Octahedral Trigonal prismatic Pentagonal pyramidal
Coordination number 7	Pentagonal bipyramidal Capped octahedral Capped trigonal prismatic
Coordination number 8	Square antiprismatic Dodecahedral Bicapped trigonal prismatic
Coordination number 9	Tricapped trigonal prismatic Capped square antiprismatic