Constructing Cr^III-centered heterometallic complexes: [NiII6Cr^III] and [CoII6Cr^III] wheels

Abstract

The solvothermal reaction between Cr(acac), MCl·6HO (M = Ni, Co) and 2-hydroxy-4-methyl-6-phenyl-pyridine-3-amidoxime (HL), under basic conditions, led to the synthesis of the heterometallic heptanuclear clusters [MCr(HL)(HL)]·3Cl (M = Ni, 1; Co, 2), with the nickel analogue displaying an S = 9/2 spin ground-state.

Rational Stepwise Construction of Different Heterometallic–Organic Frameworks (HMOFs) for Highly Efficient CO2 Conversion

“…Nevertheless, it is difficult to controlt he formation of HMOFs, because there are variousp arameters influencing the synthesis of HMOFs, such as groups in the ligands, coordinationnumbers of metal ions, solventsystem,pHvalues of solutions, reaction temperature, and the ratio of metal-to-ligand, etc. [10][11][12][13][14][15][16][17][18] In this work, ab ifunctional2 -(imidazol-1-yl)terephthalic acid (H 2 L) ligand was chosen to build new HMOFso wing to:( i) the presence of both nitrogen and oxygen donor atoms in the ligand, ( (4), have been effectively and rationally constructed from complexes 1 and 2 as the precursors, respectively (Scheme 1). Moreover, thes ynthesized HMOFs bearing dual catalytics ites (Tb and Ag) can be used as heterogeneous catalysts for the chemical fixationo fC O 2 with epoxides,i ncluding sterically hindered epoxides.…”

[(VIVO)2MII5] (M = Ni, Co) Anderson wheels

“…5 (hmp) 12 ] 4+ (M III = Cr, Al and M II = Mn, Fe, Co, Ni, Cu, 6 {(OCH 2 CH 2 ) 2 N(CH 2 CH 2 OH)} 6 ] n+ (M = Li, Na, Mg, Mn, Fe, Co, Ni) reported by Khan, 10 and the complex [M II 6 Cr (HL zw ) 6 (HL) 6 ]3+ (M = Ni, Co; HL = 2-hydroxy-4-methyl-6-phenylpyridine-3-amidoxime) published by Murrie and Milios 17. …”

[CrIII8NiII6]n+ Heterometallic Coordination Cubes

“…The latter includes 3D networks [7], 2D sheets [8], 1D chains [9], and 0D (molecular) polygons and polyhedral [10,11], investigating controllable exchange interactions [12], enhanced magnetocaloric effects [13], spin frustration [14], slow relaxation of the magnetization [15,16], and quantum coherence timescales [17]. A search of the Cambridge Structural Database (CSD) reveals that heterometallic wheels of varying size and metal ratios dominate the chemistry of polymetallic clusters containing both Cr III [18][19][20][21][22][23]. Surprisingly, the search reveals only two other unique structural motifs, a rather unusual [Cr3Ni2] linear complex [24], and an 'S-shaped' [Cr12Ni3] chain [25].…”