The Chemistry of Metal Complexes with Selenolate and Tellurolate Ligands

Steric and Electronic Properties of the Bulky Terphenyl Ligand ArtBu6 (ArtBu6 = C6H3-2,6-(C6H2-2,4,6-tBu3)2) and Synthesis of Its Tin Derivatives ArtBu6SnCl, ArtBu6SnSn(H)2ArtBu6, and ArtBu6SnSnArtBu6: A New Route to a Distannyne via Thermolysis of the Asymmetric Hydride ArtBu6SnSn(H)2ArtBu6

“…Other organo-or amido-tin(II) halides generally have dimeric structures in the solid state, as a consequence of the ease of chloride bridging and their generally lower steric crowding. 41−43 The Cl−Sn− C ipso angle is 100.19(3)°in 2, which is similar to the values of 102.31 (15)°in Ar iPr6 SnI 28 and 98.77 (9)°in Ar iPr8 SnClAr iPr8 28 and 99.67 (6)°in Ar iPr6 SnCl. 43 The Sn−Cl and Sn−C ipso distances in 2 are 2.4266(11) and 2.218(3) Å, respectively, which are lengthened in comparison to those in the monomeric Ar iPr8 SnCl, which has Sn−Cl and Sn−C ipso lengths of 2.371(3) and 2.176(6) Å, respectively, 28 or in monomeric Ar iPr6 SnCl with bond lengths of 2.4088(8) and 2.180(2) Å, respectively.…”

“…Sterically encumbering, monodentate, uninegative ligands are widely used in the stabilization of highly reactive compounds that have low coordination numbers and/or multiple bonding. , Several ligand types − have been used to isolate a large variety of these reactive species and include alkyls, aryls, amides, − phosphides, alkoxides, − and chalcogenolates. − Currently, however, it is probable that m -terphenyl groups (a subclass of the aryls) either as ligand substituents or as directly bound ligands, stabilize the widest range of low-coordinate and multiple-bonded species. ,− For example, the use of terphenyl ligands has enabled the isolation of numerous low-coordinate transition-metal compounds , including the quintuple-bonded Ar iPr4 CrCrAr iPr4 (Ar iPr4 = C 6 H 3 -2,6-(C 6 H 3 -2,6- i Pr 2 ) 2 )) . In the main-group elements the terphenyl ligands have enabled the isolation of the first heaver group 13 and 14 element alkyne analogues ,− of the elements gallium, germanium, tin, and lead as well as the first stable divalent group 14 element hydride derivatives. − The heavier group 14 dimetallynes and hydrides have shown unusual reactivity with unsaturated species such as olefins and small molecules such as H 2 that often result in cycloadditions or hydrogenations. − The structures and reactivity of the dimetallynes and hydrides can be altered by varying the steric demand and substitution pattern of the terphenyl ligand being used. − We were attracted to the bulky terphenyl ligand Ar tBu6 recently reported by Schrock, Hoyveda, and co-workers (…”

Crystalline Superlattices of Nanoscopic CdS Molecular Clusters: An X-ray Crystallography and111Cd SSNMR Spectroscopy Study

“…In many metal chalcogenide nanoclusters, metal sites have tetrahedral or distorted tetrahedral coordination environments. − Moreover, for group 12 metal chalcogenide nanoclusters (i.e., M = Zn, Cd, Hg) some frameworks have an overall tetrahedral shape, being regular fragments of ME crystalline lattices. , Such fragments contain tetrahedrally coordinated atoms and consist solely of cubic cages (such as in a basic supertetrahedral series of nanoclusters, denoted T n ) or both cubic and hexagonal cages (such as in a capped supertetrahedral series, denoted C n ). − Some examples of T n metal chalcogenolate complexes and nanoclusters are [Cd­(SPh) 4 ] 2– , [Cd 4 (SePh) 10 ] 2– , [Zn 4 (SePh) 10 ] 2– , [Zn 10 S 4 (SPh) 16 ] 4– , and [Cd 10 Se 4 (SPh) 16 ] 4– , while C n nanoclusters are represented by [Cd 17 S 4 (SPh) 28 ] 2– and [Cd 32 S 14 (SPh) 40 ] 4– . − …”

Ligand Design for the Assembly of Polynuclear Complexes: Syntheses and Structures of Trinuclear and Tetranuclear Aluminum Alkyl Complexes Bearing Tripodal Diamidoselenophosphinito Ligands and a Comparison to Related Tripodal Triamidophosphine Complexes

“…In this article we report the synthesis of diamidoselenophosphinito ancillary ligands, which favor the formation of triangular complexes with aluminum, shown in Figure as complex B . Anionic Se donors are much less common than their oxygen and sulfur analogues, and selenophosphinito donors (R 2 PSe - ) have not previously been incorporated into multidentate donor ligands, to the best of our knowledge, although related ligands are known. − …”