Crystal‐to‐Crystal Transformation of Magnets Based on Heptacyanomolybdate(III) Involving Dramatic Changes in Coordination Mode and Ordering Temperature

Recent developments in penta-, hexa- and heptadentate Schiff base ligands and their metal complexes

“…s c r i p t one [MoCl2(N3O2-SB)] was briefly reported by Howe and co-workers in 1994[139], and formulated as a seven-coordinate molybdenum(IV) complex containing the doubly deprotonated pentadentate 2,6-diacetylpyridine-bis(4-methylbenzoylhydrazone) ligand (N3O2-SB) in the equatorial plane of the complex. in 2017, Mironov et al[140], prepared a similar heptacoordinated pentagonal bipyramidal Mo(IV) complex 7, expected to be efficient Ising-spin building block for tailoring single-molecule magnets (SMMs)[141][142][143]. Complex 7 was synthesized by the reaction of (NH4)2[MoCl5(H2O)] with the pentadentate Schiff-base ligand (1,1'-(pyridine-2,6-diyl)bis(ethan-1yl-1-ylidene))dibenzohydrazine, formed by condensation of 2,6-diacetylpyridine with benzoic acid hydrazide[140].…”

Three Chiral Cyanide-Bridged Cr–Cu Complexes: Synthesis, Crystal Structures and Magnetic Properties

“…For the complex 2, its cationic binuclear structure and the cell packing diagram are shown in Figures 4 and 5, respectively. all the reported complexes, each cyanide-containing building block acting as a monodentate ligand through one of its two trans cyanide groups connects the Cu(II) ion with the other cyanide group as terminal. The Cr(III) ion (6) 2.098(9) Cu1-N1-C1 139.0(9) 141.7 (7) 159.2(10) Cr1-C1-N1 165.7(10) 165.6(7) 172.7(11) Cr1-C2-N2 176.7 (11) 178.8 (7) 175.2 (12) The complexes 1a and 1b as a pair of enantiomer, containing Cr 2 Cu 2 unit in the unit cell with a dimer structure, crystallize in monoclinic cell setting with the non-central space group P2 1 , while complex 2 crystallizes in triclinic cell setting with the non-central space group P1. All the three complexes are with the similar cationic cyanide-bridged binuclear structure and the different balance anion, i.e.…”

“…Among which, as one of the well-known magnetic transfer groups, cyanide groups usually exhibit unique advantages when assembling bimetallic or even trimetallic cyanide-bridged magnetic complexes. [5][6][7][8][9][10][11][12][13][14][15][16] Although there are many combinations of different magnetic carriers for cyanide-bridged complexes, the Cr III -Cu II system still receives much attention and many cyanide-bridged Cr III -Cu II complexes with interesting magnetic properties such as sin-gle-molecule magnets, single-chain magnets, spin crossover magnets and photo switchable magnets have been reported. [17][18][19][20] Compared with the cyanide-bridged heterometallic Fe III -M (M = Cu(II), Ni(II), Mn(II), Mn(III), et al) complexes, [21][22][23][24][25][26][27] the cyanide-bridged heterometallic Cr III -M complexes are still limited due to the shortage of stable and suitable cyanidochromate(III) building blocks.…”

A cyanide-bridged FeIII–MnII heterobimetallic one-dimensional coordination polymer: synthesis, crystal structure, experimental and theoretical magnetism investigation

“…As a well-known bridging ligand, the cyanide group generally has unique advantages in assembling bimetallic or even trimetallic magnetic CPs, since cyanide-bridged CPs are usually synthesized by a stepwise assembly strategy based on building blocks containing different magnetic carriers (Pardo et al, 2011;Zhang, Xue et al, 2016;Wang, Southerland et al, 2012;Zhang & Sato, 2010;Shatruk et al, 2009). Up to now, in order to clarify the magneto-structural correlation of lowdimensional magnetic systems and to prepare interesting lowdimensional molecule-based magnetic materials, we have developed a series of cyanide building blocks containing larger equatorial plane ligands and two trans-cyanide groups (Zhang et al, 2013;Zhang, Si et al, 2014;Shi, Lan et al, 2018;Shi, Meng et al, 2018;Zhang et al, 2019).…”