Darstellung und eigenschaften des komplexes (dipy)Ni(η2-PhC2SiMe3). Zur korrelation struktureller bindungsparameter mit IR- und NMR-spektroskopischen daten in übergangsmetall-alkin-komplexen

Synthesis and Characterisation of Selected Group 4 Metallocene Complexes with 1,2‐Bis(4′,4′,5′,5′‐tetramethyl[1′,3′,2′]dioxaborolan‐2′‐yl)acetylene

“…To characterise the alkyne complexation of bPinBA in 5 and 6, the obtained structural data of these compounds were compared to those of the similar metallacyclopropenes of btmsa 1b-Ti and 1a-Zr. [17] The alkyne bond lengths of 1.289(3) Å for 5 and 1.301(3) Å for 6 are similar to those of the corresponding btmsa complexes 1b-Ti and 1a-Zr. Three parameters are usually used to interpret the strength of the coordination in complexes incorporating the same alkyne: the C1-C2 bond length in the bound alkyne, for which a longer bond indicates stronger coordination; the M-C alkyne distances, for which a greater value implies weaker coordination; and the so-called bend-back angle, which describes the deviation of the C1-C2-X angle from the ideal 180°found in the free alkyne.…”

Si-H Activation in Titanocene and Zirconocene Complexes of Alkynylsilanes RC≡CSiMe2H (R=tBu, Ph, SiMe3, SiMe2H): A Model To Understand Catalytic Reactions of Hydrosilanes

“…Compounds lacking the strong Si-H-M interaction (5 ± 7, 9 a ± 12 a) are characterized by parameters similar to those applied to common alkyne complexes, [28] and the data for the SiMe 2 H group differ little from those of the free silanes.…”

Novel Amidoniobium Complexes with a Functional Relationship to the [Cp2ZrR]+ Ion*

“…[6] The niobacyclopropene ring in 2 is extremely stable and does not react with ketones, styrene oxide, alkynes, and olefins, as known for the metallocene alkyne complexes of the titanium triad. [7] Complexes with only two amido ligands are accessible by using the sterically more demanding aminopyridinato (Ap) ligands.…”