Element‐Element‐Bindungen. XI Kettenbildung bei kristallinen Dimethyldichalkogenanen

Abstract

The structures of dimethyldichalkogenanes (H 3 C) 2 E 2 liquid at room temperature have been determined by single-crystal x-ray diffraction {E ϭ S, α-form 1a, P2 1 /c; Z ϭ 4; a ϭ 860.9(5); b ϭ 648.0(4); c ϭ 845.9(4) pm; β ϭ 94.23(4)°; Ϫ141 ± 2°C; β-form 1b, P2

Syntheses and Structures of Two Dimethyl Diselenide–Diiodine Adducts and the First Well Characterized Diorgano Disulfide–Nitrosonium Adduct

“…[C 10 H 22 S 2 ·NO + TfO -] crystallizes in the monoclinic space group C2/c. The known gauche configuration of diorgano dichalcogenides [17] changes to a trans configuration with a C-S-S-C torsion angle of 160°. The N-O bond length is 1.1 Å, similar to those of other nitrosonium CT complexes.…”

“…2.03(1) Å]. [17] In the nitrosonium-bonded dimethyl disulfide complex the parameters are between the two extremes, the electron density value is 0.158 with bond length of 2.019 Å. Figure 6 shows a potential energy profile of Me 2 S 2 and Me 2 S 2 + relative to the C-S-S-C torsion angle.…”

Covalently bonded compounds of heavy group 15/16 elements – Synthesis, structure and potential application in material sciences

“…[26] A slight modification of the pincer-type ligand gave also access to monomeric ). [26] The compounds are monomeric in solution, as was shown by 1 (8)). [116] Moreover, the Sb-E bonds in the monomeric compounds ArSbE (E = Se, Te) and Ar'SbE (E = S, Se) are significantly shorter than the calculated Sb-E single bond values (∑ cov (Sb, E) 2.43 Å (E = S), 2.56 Å (E = Se), 2.93 Å (E = Te)), [59] but are only slightly enlarged compared to the calculated value of a Sb=E double bond (∑ cov (Sb, E) 2.27 Å( E = S), 2.40 Å (E = Se), 2.61 Å (E = Te)).…”

“…Moreover, electron withdrawing substituents rather suppress the formation of intermolecular contacts, i.e. dimethylditellurane Te 2 Me 2 forms a chain-like structure in the solid state, [1] whereas the shortest intermolecular distance in bis(trifluormethyl)ditellurane Te 2 (CF 3 ) 2 exceed the sum of the van-der-Waals radii of the metal atoms. [2] Comparable findings were observed in tetraalkyldistibines and -dibismuthines, which often show chainlike structures in the solid state with weak intermolecular metal-metal interactions.…”

Different coordination modes of the dimethyldisulfide ligand in trimethylplatinum(IV) complexes

“…It can be understood as a superposition of an A 6 , an A 3 B 3 X and an A 3 A 0 3 XX 0 spin system (A, B = 1 H, X = 195 Pt) in the characteristic integral ratio given before. Thus, the two methyl groups are chemically equivalent (neglecting the isotope shift in the isotopomer having one Table 2 Comparison of structural data (lengths in Å , angles in degree) of MeSSMe in the gas phase (microwave data) [41], in crystals of MeSSMe [42] and in the platinum complex 3 coordination mode (analogous to 5a) were found in this work [24,25].…”