Here are structures for a number of polydentate ligands commonly encountered in inorganic chemistry.

en (ethylenediamine)
acac (acetylacetonate (-1) ion)
bipy (2,2'-bipyridyl)
phen (1,10-phenanthrolene)
diars (1,2-phenylenebis(dimethylarsine))
dppe (1,2-bis(diphenylphosphino)ethane
dtc (diethyldithiocarbamate)
dimethylglyoxime
ox (oxalate (-2) ion)
gly (glycinate (-1) ion)
dien (diethylenetriamine)
trien (triethylenetetramine)
edta (ethylenediaminetetraacetic acid (-4) ion)