Self-assembly of supramolecular architectures based on polybromide anions: crystal structure of [tppz=tetra(2-pyridyl)pyrazine]

An Adaptable and Dynamically Porous Organic Salt Traps Unique Tetrahalide Dianions

“…The structure of anhydrous 1 b (determined from single-crystal XRD, see the Supporting Information) and its hydrate as well as of 1 a,c [10] confirm that this is also the case for our starting materials. The formation of 2 a-c from 1 a-c by solid-gas reactions described above proves the dynamic behavior of crystalline hexamethonium halides, but also reveals some limitations (under the conditions adopted) in the encapsulating ability of the HMET 2+ cation and its tendency to selectively pin a tetrahalide dianion, as 2 b,c are formed exclusively also when one equivalent of I 2 is used.…”

Reactions of pyridyl donors with halogens and interhalogens: an X-ray diffraction and FT-Raman investigation

“…As observed for ðH 2 3 2þ Þ½BðC 6 H 5 Þ À 4 2 , these N-HÁ Á ÁN bridges are rather short even for proton sponges [8,37], and result in a deformation of the C(5)-C(6)-C(7) and C(6)-C(7)-C(8) angles, which are expanded to the very unusual values of 129.7(5) and 130.4(5)°. The H 2 3 2+ dication interacts with the ICl À 2 anions through an extended network of hydrogen bonds [C(10)-…”

“…In addition, the crystal structure of 1 has been obtained. The crystal data for 1, (H1 + )Br À , (H1 + )Cl À , ðH2 þ ÞI À 3 , 3 AE 2IBr, and ðH 2 3 2þ ÞðICl À 2 Þ 2 are summarised in Table 2, while the structure of ðH 4 3 4þ ÞðBr 2À 4 ÞðBr À Þ 2 has been recently reported elsewhere [8]. The crystal structure of 1 does not present any new points of interest compared to those of the other thioparabanic acid derivatives reported previously [32,33].…”

“…The tendency of halogens to catenate and form extended polyanions with general formula X nÀ 2m þ n ðn; m > 0Þ increases on passing from chlorine to iodine [2]. Thus, while a large number of discrete polyiodides [2,3], up to I 3À 29 [4], and some examples of infinite networks [5,6] are known, only few extended polybromides, such as Br 2À 4 [7,8] and Br 2À 8 [9], and only one case of infinite polybromide network [10] have been characterised in the solid state. The nature of the component building blocks is reflected in the Raman response of the assembled frameworks, since all polyhalide and polyhalogen networks show Raman peaks related to the vibrational modes of X 2 and X À 3 building blocks perturbed by XÁ Á ÁX and/or XÁ Á Ádonor interactions [5,11,12].…”

Struktureller Beweis für ein höheres Polybromidmonoanion: Untersuchung von [N(C3H7)][Br9]

“…[10][11][12] Alle weiteren bekannten Polybromidmonoanionen (Penta-, Hepta-und Nonabromid) wurden nur mithilfe von IR-und/ oder Raman-Spektroskopie charakterisiert, weshalb ihre Strukturen lediglich auf Basis dieser Daten , [7] oder als Polybromidnetzwerke, [7,[14][15][16] [17,18] zur Wasseraufbereitung [19] und in selektiven Bromierungen finden. [20] [8] Allerdings zeigte sich bei dieser früheren Studie, dass die weiteren mçglichen Strukturisomere von B (C 2v ), E (D 3h ) und F (D 4h ) als Übergangszustände oder Sattelpunkte hçherer Ordnung vorliegen (Abbildung 3).…”