Self-Assembly Using Dynamic Coordination Chemistry and Hydrogen Bonding:  Mercury(II) Macrocycles, Polymers and Sheets

Abstract

The self-assembly of extended metal-containing arrays is described based on dynamic coordination chemistry at mercury(II) with bis(amidopyridyl) ligands to form macrocycles, polymers, or sheets which can be further organized by hydrogen bonding between amide substituents. The ligands 1,2-C6H4[NHC(O)-4-C5H4N]2, 1, 1,2-C(6)H(4)[C(O)NHCH(2)-4-C(5)H(4)N](2), 2, and 1,2-C(6)H(4)[CH(2)C(O)NHCH(2)-4-C(5)H(4)N]2, 3 can adopt polar conformations and so can confer helicity in their complexes. Several macrocycles of formula [(HgX(2))(2)(micro-LL)(2)] (LL = 1, 2), with tetrahedral mercury(II) centers, were prepared in which individual molecules are further self-assembled via hydrogen bonding in the solid state to form one- or two-dimensional polymers or sheets. In one case, a one-dimensional polymer [((HgX2)-(mu-3))n] was formed. It is shown that the mercury(II) centers can be six-coordinate in forming the sheet structure [((HgX2)(mu-2)2)n], in which there are particularly large pores.

Synthesis and structure of the 2-(chlorophenylazo)pyridine chelated tricarbonylrhenium(I) complex and its anion radical derivatives via electrochemical reduction

“…We also note that, in particular, the chemistry of tricarbonylrhenium(I) is of abiding interest in the context of bioconjugate synthesis [2], anion radical formation [3], potential photophysical [4] and radiopharmaceutical [2,5] properties. In addition, the investigation of secondary interactions such as MClÁ Á ÁH-C hydrogen bonding and ClÁ Á ÁO non-bonding interactions have also received a great deal of attention in the context of crystal engineering, molecular recognition and supramolecular chemistry [6,7]. We have been concerned here with the reactivity of azoheterocycles which have been shown to act as versatile ligands suitable for stable binding of all oxidation states of rhenium in the interval +1 to +5 [8][9][10].…”

Complexes of gold(I) with a chiral diphosphine and bis(pyridine) ligands: Isomeric macrocycles and a polymer

“…Elemental analyses were carried out by Guelph Chemical Laboratories, Guelph, Canada. The complexes [Au 2 (µ-(∀)binap)Cl 2 ], [Au 2 (µ-(∀)binap)X 2 ], 1a -1c, and bis(amidopyridyl) ligands 2 -4 were prepared by literature methods [18][19][20][23][24][25][26]45]. The 1 H NMR labeling scheme is shown below for the bis(amidopyridyl) ligands (Chart 3).…”

“…Several ligands of this type were studied but crystalline complexes suitable for X-ray structure determination were obtained only with the ligands LL = 2 -4 (Chart 1). The related ligands 2 [23][24][25][26][27][28][29][30][31][32][33] and 3 [24,26,28,30,33,[34][35][36][37][38][39][40][41], which contain 4-pyridyl and 3-pyridyl groups respectively, are angular whereas ligand 4 [42][43][44][45][46][47][48][49][50][51] is more linear, though it should be recognized that all of these ligands are flexible and can adapt to several different coordination geometries.…”

Syntheses and crystal structures of two supramolecular isomers of manganese(II) with 3,5-bis(isonicotinamido)benzoate

“…However, control of formation of supramolecular complexes is still a challenge. Our strategy in this approach is using a new organic ligand 3,5-bis(isonicotinamido)benzoic acid (HBBA), prepared according to the procedure reported by Burchell et al [8], containing carboxylate and pyridine. Amide possesses two types of hydrogen bonding sites, ÀNH as an electron acceptor and ÀC¼O as an electron donor [9][10][11].…”