Molecular tectonics: from enantiomerically pure sugars to enantiomerically pure triple stranded helical coordination network

Abstract

The self-assembly between a bis-monodentate tecton based on two pyridine units connected to an enantiomerically pure isomannide stereoisomer and HgCl2 leads to the formation of an enantiomerically pure triple stranded helical infinite coordination network which was structurally characterised by X-ray diffraction on single crystal.

An Investigation of the Self‐Assembly of Neutral, Interlaced, Triple‐Stranded Molecular Braids

“…Crystal data for 6: M r = 474.95; triclinic; P1 ; a = 9.066(3), b = 9.266(3), c = 12.700(4) ; a = 99.593 (7), b = 92.832 (7), g = 97.528(6)8; V = 1040.1 (6) 3 ; Z = 2; 1 calcd = 1.516 g cm À3 ; R 1 = 0.0603; wR 2 = 0.1666; S = 0.935.…”

“…Discrete triple-stranded intertwining chains are generally apt to form a homochiral triple helix in crystal engineering. The first triple helix, made by Rajasekharans group, [5] the enantiomerically pure triple-helix from Hosseinis group, [6] and the nanotube-containing triple-helix reported by Lins group [7] serve as impressive examples of this topology. However, to the best of our knowledge, there is only one example of an interlaced, triple-stranded molecular braid, namely that reported by our group recently.…”

“…4 ·2 H 2 O] stoichiometry of 2:1, contains a neutral, interlaced, triple-stranded molecular braid, which is interwoven by three single-stranded meso-helical chains that contain only a mononuclear node. With the three aromatic chelating terminal ligands 2,2':6',2''-terpyridine (tpy), 1,10-phen-A C H T U N G T R E N N U N G anthroline (phen), and di(2-pyridyl)-A C H T U N G T R E N N U N G amine (dpa) we have also prepared three neutral complexes containing the linear, rigid bridging ligand biphenyl- (6). An infinite meso-helix is formed initially in 4, and then three of these chains assemble into a triplestranded braid similar to that of 3.…”

Molecular tectonics: design and structural analysis of enantiomerically pure tectons and helical coordination networks

“…Indeed, using HgCl 2 as a metallatecton, whereas the tecton 1 leads to the formation of a single stranded helical architecture, the tecton 2 generates a triple helix [11].…”

“…In particular, the tecton 1, because of the chiral nature of isomannide, is an enantiomerically pure unit suitable for the formation of helical coordination networks when associated with a metallatecton offering two available coordination sites. For that reason and based on our previous studies [11,15], HgCl 2 , a neutral metallatecton presenting two available coordination sites, was considered. …”