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These complexes, with the general formula [Ni(\u03b7\u2010R<jats:italic><jats:sub>n<\/jats:sub><\/jats:italic>\u2010Ind)(EPh<jats:sub>3<\/jats:sub>)<jats:sub>2<\/jats:sub>]BF<jats:sub>4<\/jats:sub> (E = As, Sb), were structurally characterized by NMR spectroscopy and X\u2010ray diffraction, and subsequently tested as single\u2010component catalysts for the oligomerization of styrene, leading to the formation of very low molecular weight head\u2010to\u2010tail oligomers (typically consisting of dimers, trimers and tetramers). The new 1\u2010 or 2\u2010monosubstituted\u2010indenyl Ni<jats:sup>II<\/jats:sup> catalyst precursors exhibit extremely high catalytic activities, considerably higher than those observed for the symmetrical unsubstituted\u2010 and the 1,3\u2010disubstituted\u2010indenyl nickel analogues (i.e. monosubstituted &gt;&gt; non\u2010substituted &gt; 1,3\u2010disubstituted), their reactivity pattern showing similarities with that of the corresponding allyl derivatives. A simpler and more straightforward experimental procedure for the high yield preparation of [NiBr<jats:sub>2<\/jats:sub>(DME)], an important nickel starting material, which was used in the preparation of the bis(indenyl) nickel precursors of this work, is also described.<\/jats:p>","DOI":"10.1002\/ejic.201701197","type":"journal-article","created":{"date-parts":[[2017,11,26]],"date-time":"2017-11-26T21:59:02Z","timestamp":1511733542000},"page":"597-607","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Cationic R\u2010Substituted\u2010Indenyl Nickel(II) Complexes of Arsine and Stibine Ligands: Synthesis, Characterization, and Catalytic Behavior in the Oligomerization of Styrene"],"prefix":"10.1002","volume":"2018","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3672-0045","authenticated-orcid":false,"given":"Clara S. 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