Synthese und Struktur eines viergliedrigen Tellur — Stickstoff‐Rings

Münzenberg, Jörg; Noltemeyer, Mathias; Roesky, Herbert W.

doi:10.1002/cber.19891221014

Cited by 26 publications

(1 citation statement)

References 10 publications

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“…42 1,1,1,3,3,3-Hexachloro-2,4-bis(triphenylphosphoranylidene)ditelluradiazetidine (dichloromethane solvate), [KAWTIL], is a centrosymmetric four-membered cyclic molecule containing a Te 2 N 2 ring (Te-N 1.996 and 2.282 A ˚). 43 One of the phenyl groups attached to phosphorus occupies the empty space in the vicinity of each tellurium atom, with a Te … centroid distance of 3.923 A ˚(Fig. 8), which is at the verge of the van der Waals distance.…”

Section: Intramolecular Te … P-aryl Interactions In Monoand Di-nuclea...mentioning

confidence: 99%

Tellurium⋯π-aryl interactions: a new bonding motif for supramolecular self-assembly and crystal engineering

Zukerman-Schpector

Haiduc

2002

CrystEngComm

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A search of the Cambridge Structural Database (CSD) was performed to identify Te … p-aryl interactions not reported before in the literature. The examination of the distance between tellurium atoms and aryl group centroids and the analysis of crystal packing, using deposited crystal structure data, produced a list of organotellurium compounds which showed a variety of Te … p bonding interactions. These include inter-ionic Te … p interactions in anion-cation ion pairs, intramolecular Te … p-aryl interactions in mono-and di-nuclear covalent molecular compounds, as well as in dimeric and tetrameric supermolecules or in supramolecular polymeric arrays formed through secondary bonds. Most interesting was the finding that intermolecular Te … p aryl interactions can connect molecular tectons, leading to supramolecular self-assembly with formation of dimeric and polymeric superstructures. Finally, Te … p aryl interactions may interconnect polymeric chains formed through Te … X secondary bonds into 2D and perhaps 3D networks. Thus, the Te … aryl interactions appear as a new bonding motif for supramolecular self-assembly, which could be exploited for crystal engineering in organotellurium chemistry, i.e. for the design of new materials with attractive useful properties.

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Section: Intramolecular Te … P-aryl Interactions In Monoand Di-nuclea...mentioning

confidence: 99%

Tellurium⋯π-aryl interactions: a new bonding motif for supramolecular self-assembly and crystal engineering

Zukerman-Schpector

Haiduc

2002

CrystEngComm

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Novel Coordination in the First Tellurium Porphyrin Complex: Synthesis and Crystal Structure of [Te(ttp)Cl2]

et al. 2001

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Despite the wealth of fundamental and applied research on porphyrin complexes of the metallic elements, non-metal porphyrin complexes have been much less extensively studied. [1] Porphyrin complexes of the groups 13 ± 15 elements are well-established, but as yet no porphyrin complex of any group 16 element is known. Gouterman and co-workers reported UV/Vis spectral changes on reaction of free-base porphyrins with TeCl 4 and SeCl 4 , but no well-characterized species were isolated. [2] As part of our continuing studies of main group porphyrin complexes, [3] we have investigated the synthesis, characterization, and molecular structure analysis of the first tellurium porphyrin complex.The reaction between tellurium(iv) chloride and one equivalent of the dilithium meso-tetra-p-tolylporphyrin salt, Li 2 (ttp), in refluxing hexane yielded a dark green solid of [Te(ttp)Cl 2 ] (72 % yield). [Te(ttp)Cl 2 ] is moisture sensitive in solution and decomposes on exposure to air within seconds. However, it is stable in the solid state for weeks at ambient temperature in the dark in an inert atmosphere.The molecular structure of [Te(ttp)Cl 2 ] [4] is presented in Figure 1. The two molecules are related by a crystallographic inversion center. The tellurium coordination sphere is best described as a square pyramid in which the atoms Cl(1), Cl(2), N(1), and N(3) form the square base of the pyramid and are coplanar to within 0.024 ä. The angles at the Te center from the apical atom to the basal atoms range from 78.27(10) to 89.73(8)8. Three of the porphyrin nitrogen atoms occupy one triangular face of the square pyramid, with the apical TeÀN(2) bond length significantly shorter than those of the basal TeÀN(1) and TeÀN(3) bonds. Five-coordinate Te IV complexes are typically square pyramidal with a short bond to the apical atom. Comparable examples with a TeCl 2 N 3 coordination sphere are difficult to find, but several closely related TeCl 3 N 2 complexes show basal TeÀCl bond lengths in the range 2.370 ± 2.563 ä, basal TeÀN bond lengths in the range 2.185 ± 2.352 ä, and apical TeÀN bond lengths in the range 1.996 ± 2.096 ä. [5] The basal TeÀCl, basal TeÀN, and apical TeÀN bond lengths observed for [Te(ttp)Cl 2 ] are consistent with these. Figure 1. ORTEP plot of [Te(ttp)Cl 2 ]. The meso-tolyl groups and hydrogen atoms are omitted for clarity. Thermal ellipsoids are at the 30 % probability level. Selected bond lengths [ä] and angles [8]: Te-N(1) 2.The fourth porphyrin nitrogen atom (N(4)), and a chlorine atom from the symmetry-related molecule (Cl(2A)), are found on the open square face of [Te(ttp)Cl 2 ] at much longer TeÀN and TeÀCl distances. The TeÀN(4) separation (2.598(3) ä) considerably exceeds the sum (2.11 ä) of the covalent radii of tellurium and nitrogen atoms but is within the sum of the van der Waals radii (3.61 ä). Similarly, the long TeÀCl(2A) distance is within the sum of the van der Waals radii of Te and Cl atoms (3.81 ä). [6] The remarkable aspect of the structure of [Te(ttp)Cl 2 ] is the fact that it adopts five-c...

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Novel Coordination in the First Tellurium Porphyrin Complex: Synthesis and Crystal Structure of [Te(ttp)Cl2]

Grubisha

Guzei²,

Al-Salim³

et al. 2001

Angew. Chem. Int. Ed.

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Synthese und Struktur eines viergliedrigen Tellur — Stickstoff‐Rings

Cited by 26 publications

References 10 publications

Tellurium⋯π-aryl interactions: a new bonding motif for supramolecular self-assembly and crystal engineering

Tellurium⋯π-aryl interactions: a new bonding motif for supramolecular self-assembly and crystal engineering

Novel Coordination in the First Tellurium Porphyrin Complex: Synthesis and Crystal Structure of [Te(ttp)Cl2]

Novel Coordination in the First Tellurium Porphyrin Complex: Synthesis and Crystal Structure of [Te(ttp)Cl2]

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