( These ( ( ( ( ( contain ( a ( heavy ( metal atom ) ) ) ) ( at ( ( the centre ) ( of ( the molecule ) ) ) ) ) , ) ( for ( ( ( example ( ( platinum or ) iridium ) ) , ) ( ( of which ) ( ( ( ( the ( green ( emitting ( complex Ir ) ) ) ) ( -LRB- ( mppy -RRB- ) ) ) 3 ) ( is ( ( just one ) ( of ( many examples ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT These)) (VP (VBP contain) (NP (DT a) (JJ heavy) (NN metal) (NN atom)) (PP (IN at) (NP (NP (DT the) (NN centre)) (PP (IN of) (NP (DT the) (NN molecule))))) (, ,) (PP (IN for) (NP (NP (NN example) (NN platinum) (CC or) (NN iridium)) (, ,) (SBAR (WHPP (IN of) (WHNP (WDT which))) (S (NP (NP (NP (DT the) (JJ green) (JJ emitting) (JJ complex) (NN Ir)) (PRN (-LRB- -LRB-) (NP (NN mppy)) (-RRB- -RRB-))) (ADJP (CD 3))) (VP (VBZ is) (NP (NP (RB just) (CD one)) (PP (IN of) (NP (JJ many) (NNS examples)))))))))) (. .)))
These contain a heavy metal atom at the centre of the molecule, for example platinum or iridium, of which the green emitting complex Ir(mppy)3 is just one of many examples.
(ROOT (S (NP (NNP Water)) (VP (VBZ contains) (NP (CD 3) (NNS atoms))) (. .)))
Water contains 3 atoms.