Shapes Of Complexes And Naming Flashcards
Why don’t you look at lps on central metal ion when deciding on shape
As there are too many lps to consider
When are octahedral complexes formed
When there is six-fold coordination with monodentate ligands
What shape do Cl- ligands always form and why
Tetrahedral, usual shape for complexes with larger anionic ligands. Negative charges and size increase repulsion’s causing a decrease in coordination number from more common 6 to 4
Bond angle in octahedral complex
90 degrees
Which type of complex can show optical isomerism
Tetrahedral complexes
What shape do complexes do platinum and nickel form
Square planar shape, consists of four coordinate bonds with bond angle of 90 degrees
Structure of cisplatin
Central platinum with two Cl below and two NH3 above
What is cisplatin used as and why
Cancer therapy drug, targets components of cells that are chiral so only one isomer of the drug will be correct orientation to fit the cells, binds to DNA in cancer cells preventing their division
Structure of trans-platin and why is it not used in medicine
One Cl above and below and NH3 above and below, more toxic than cis platin
Negatives of cis-platin and how these are overcome
Serious side effects eg hair loss, has to be administered in small amounts
How to name when overall ion is anion
Name of element modified to have name ending ‘ate’ eg copper becomes cuprum
How to name complex with four cyanide ions bonded to nickel atom
Tetracyanonickelate (II)
Why can cis-trans isomerism occur in square planar complexes
Because ligands cannot rotate around central metal ion
Name for complex with Zn2+ and four OH- ligands and overall charge
Tetrahydroxozincate (II) overall 2-
How to name Al3+ bonded to four hydride ions and overall charge
Tetrahydridoaluminate (III) overall 1- charge
