Novel 36-membered dodecanuclear manganese metalladiazamacrocycle

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 novel 18-membered metallacrown containing a double-azathiacrown

“…This organization results in an 18-membered hexanuclear core ring system with a [Fe-N-N] repeat unit. The possible ring strain in a planar conformation can be released by the puckering of the macrocyclic ring, which can be considered as a thermodynamically more stable structure than the strained planar conformation [20]. The approximate dimensions of the oval-shaped cavity are about 4.560 Å in diameter at the entrance, 9.908 Å at its diameter at the center of the cavity.…”

“…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].…”

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

“…Six ethyl groups of the N-propionyl side chains in I are alternatively directed into two faces of the metal ring, as shown in most of azametallacrowns (Fig. S3b) [5][6][7][8][9][10][12][13][14][15][16][17][18]. However, only four N-terminal groups in II are directed symmetrically outside the ring, while two symmetry-related N-ends are directed to the inner core of the ring (Fig.…”

“…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].…”