Darstellung und Eigenschaften von Chrom(II)‐carboxylaten. IV. Neue Addukte des Chrom(II)‐acetats und ‐formiats mit sauerstoff‐ und stickstoffhaltigen Liganden sowie Chrom(II)‐Salze substituierter Essigsäuren

Herzog, S.; Kalies, W.

doi:10.1002/zaac.19673510503

Cited by 21 publications

(1 citation statement)

References 19 publications

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“…The dark red color of this binuclear chromium(II) acetate is striking in view of the light blue aqueous Cr(II) solution from which it is precipitated by addition of acetate. Further work, notably by Herzog and Kalies, − led to the synthesis of more dichromium tetracarboxylate complexes, later recognized as having Cr–Cr quadruple bonds. The scope of binuclear complexes with Cr–Cr multiple bonds studied experimentally or computationally now extends beyond the dichromium tetracarboxylates to include other paddlewheel complexes with various bidentate ligands of the (X–CY) type.…”

Section: Chromium–chromium Bondsmentioning

confidence: 99%

Metal–Metal (MM) Bond Distances and Bond Orders in Binuclear Metal Complexes of the First Row Transition Metals Titanium Through Zinc

2018

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This survey of metal–metal (MM) bond distances in binuclear complexes of the first row 3d-block elements reviews experimental and computational research on a wide range of such systems. The metals surveyed are titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, and zinc, representing the only comprehensive presentation of such results to date. Factors impacting MM bond lengths that are discussed here include (a) the formal MM bond order, (b) size of the metal ion present in the bimetallic core (M2) n+, (c) the metal oxidation state, (d) effects of ligand basicity, coordination mode and number, and (e) steric effects of bulky ligands. Correlations between experimental and computational findings are examined wherever possible, often yielding good agreement for MM bond lengths. The formal bond order provides a key basis for assessing experimental and computationally derived MM bond lengths. The effects of change in the metal upon MM bond length ranges in binuclear complexes suggest trends for single, double, triple, and quadruple MM bonds which are related to the available information on metal atomic radii. It emerges that while specific factors for a limited range of complexes are found to have their expected impact in many cases, the assessment of the net effect of these factors is challenging. The combination of experimental and computational results leads us to propose for the first time the ranges and “best” estimates for MM bond distances of all types (Ti–Ti through Zn–Zn, single through quintuple).

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