( ( ( ( ( ( No indication ) ( was ( found ( of ( ( ( sandwich-type bonds ) ( between ( ( ( the ( delocalized electrons ) ) and ) ( the metal ) ) ) ) ( -LRB- ( ( as ( are ( ( ( seen ( in ferrocene ) ) , ) ( for example ) ) ) ) -RRB- ) ) ) ) ) ) ) , ) but ) ( ( the anion ) ( can ( ( ( ( form ( metal complexes ) ) ( with ( ( a ( large variety ) ) ( of ( bonding patterns ) ) ) ) ) , ) ( ( involving ( from ( only one ) ) ) ( to ( ( all five ) ( of ( its ( oxygen atoms ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT No) (NN indication)) (VP (VBD was) (VP (VBN found) (PP (IN of) (NP (NP (JJ sandwich-type) (NNS bonds)) (PP (IN between) (NP (NP (DT the) (JJ delocalized) (NNS electrons)) (CC and) (NP (DT the) (NN metal)))) (PRN (-LRB- -LRB-) (SBAR (IN as) (S (VP (VBP are) (VP (VBN seen) (PP (IN in) (NP (NN ferrocene))) (, ,) (PP (IN for) (NP (NN example))))))) (-RRB- -RRB-))))))) (, ,) (CC but) (S (NP (DT the) (NN anion)) (VP (MD can) (VP (VB form) (NP (NN metal) (NNS complexes)) (PP (IN with) (NP (NP (DT a) (JJ large) (NN variety)) (PP (IN of) (NP (NN bonding) (NNS patterns))))) (, ,) (S (VP (VBG involving) (PP (IN from) (NP (QP (RB only) (CD one)))) (PP (TO to) (NP (NP (QP (DT all) (CD five))) (PP (IN of) (NP (PRP$ its) (NN oxygen) (NNS atoms)))))))))) (. .)))
No indication was found of sandwich-type bonds between the delocalized electrons and the metal (as are seen in ferrocene, for example), but the anion can form metal complexes with a large variety of bonding patterns, involving from only one to all five of its oxygen atoms.
(ROOT (S (NP (NNS Electrons)) (ADVP (RB always)) (VP (VBP result) (PP (IN in) (NP (NP (DT an) (NN anion)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (ADJP (ADJP (JJR larger)) (PP (IN than) (NP (DT the) (NN parent) (NN atom)))))))))) (. .)))