Encapsulation of a guest molecule in a strained form: an extended 36-membered dodecanuclear manganese metallamacrocycle that accommodates a cyclooctane in the S4 symmetry conformation

Abstract

An extended 36-membered dodecanuclear manganese metallamacrocycle with S12 symmetry has been synthesized using the ligand N-cyclohexanoylsalicylhydrazide (H3chxshz) by a self-assembly that accommodates a cyclooctane of conformationally strained S4 symmetry in its hydrophobic cavity.

A 1D copper(II) chain featuring novel hexanuclear secondary building blocks: Synthesis, crystal structure and magnetic property

“…As a type of multidentate ligands containing N, O donors, the N-acyl-salicylhydrazide ligands have attracted much attention and have been widely used to construct polynuclear metal complexes with interesting structural motifs [4,[12][13][14]. Diazabridged metallamacrocycles can be readily obtained when the Nacyl-salicylhydrazide ligands coordinate in trianionic pentadentate mode to a trivalent octahedral metal ion such as Ga(III), Co(III), Fe (III) and Mn(III) [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. The size of the ring of the metallamacrocycle can be tuned by varying the steric volume of the N-acyl residue of the ligand.…”

A mixed-type of azametallacrown containing [Mn6(pnhz)6(DMF)4(H2O)2] and [Mn6(pnhz)6(DMF)2(H2O)4] constructed by a flexible pentadentate ligand

“…Among the MCs, diaza-bridged metallacrowns (azaMCs) have gained ever increasing concern in the field of supramolecular chemistry, self-assembly and host-guest chemistry for their fascinatingly symmetrical multi-nuclear frameworks [5][6][7][8][9][10][11] and their potential applications as secondary building units (SBUs) in the construction of 2-or 3-D metal-organic frameworks (MOFs) through the bridging exo-bidentate ligands [12,13]. The self-assembly of the high-nuclear azaMCs with rigid N-terminal ligands has been intensively and, to some extent, successfully investigated [14][15][16][17][18][19][20][21][22][23][24], while of less interest is the exploration of the highly flexible N-terminal groups in such system, which may adjust various geometric modes to satisfy the requirements of assembly process and lead to interestingly structural topologies. Moreover, only few examples have been reported concerning the flexible N-terminal ligands, where diversely geometric configurations of the ligands are involved in one kind of 18-MC-6 [25,26].…”

A novel 18-membered metallacrown containing a double-azathiacrown

“…The dihydrazide derivative template ligands (Fig. 1a) were used to synthesize the second type of metallacrowns, the rings of the metallacrowns were expanded from 15-MC-5 to 18-MC-6 [11][12][13][14][15], 24-MC-8 [16,17], 30-MC-10 [18,19], 36-MC-12 [20,21], even to 60-MC-20 [22].…”