A novel 3D malonato-bridged compound Cu(mal)(pz)2: synthesis, spectroscopy, crystal structure and magnetism

Long-range antiferromagnetic order in malonate-based compounds Na2M(H2C3O4)2·2H2O (M = Mn, Fe, Co, Ni)

Newly synthetized metal malonates of formulae Na₂M(H₂C₃O₄)₂·2H₂O (M = Mn, Fe, Co, Ni) exhibit distinct long-range antiferromagnetic orders despite their similar structure and chemistry.

Oxalate-mediated long-range antiferromagnetism order in Fe2(C2O4)3·4H2O

Neutron powder diffraction and susceptibility measurements reveal the long range antiferromagnetic order mediated by oxalate molecules in Fe₂(C₂O₄)₃·4H₂O.

Synthesis, Crystal Structure and Magnetic Properties of a Dinuclear Mn(II) Complex with two syn–Anti Bridging Carboxylate Groups

The dinuclear Mn(II) complex [Mn2(L)2(bipy)4]·(ClO4)2·3H2O (HL = 2-benzothiazolylthioacetic acid; bipy = 2,2'-bipyridine) has been synthesised and characterised by single crystal X-ray diffraction, IR and elemental analysis. In the dimeric, cationic complex with a crystallographic centre of symmetry, two bipy molecules chelate each Mn atom. These two metal fragments are then bridged by two L groups in a syn–anti conformation with a Mn···Mn distance of 4.767 Å. The arrangement of these dimers allows the formation of tunnels that host the ClO4- anions and lattice water molecules through hydrogen bonds. Magnetic susceptibility measurement revealed antiferromagnetic coupling between the metal centres.

Robust recognition of malonate and 2-amino-4-picolinium in conjunction with M(II) as a triad (M = Ni/Co/Mn): role of this highly stable hydrogen-bonded motif in driving supramolecular self-assembly

The crystal lattice of the three isostructural compounds , (C(6)H(8)N(2)H)(2)[M(C(3)H(2)O(4))(2)(H(2)O)(2)].4H(2)O (C(6)H(8)N(2)H = protonated 2-amino-4-picoline, M = Ni/Co/Mn, C(3)H(4)O(4) = malonate dianion; hereafter, malonate) is formed by supramolecular 2D layers. Hydrogen-bonding, pi...pi and lone pair...pi interactions play crucial role in organizing monomeric [M(II)(mal)(2)(H(2)O)(2)] units into 2D sheets along the ab plane, through the self-association between two different supramolecular building blocks, namely a tetrameric water cluster including metal-coordinated water molecules, and R(2)(2)(8) and R(2)(2)(7) hydrogen-bonded recognition synthons between 2-amino-4-picolinium and malonate. DFT calculations clearly show that the robust 2-amino-4-picolinium/malonate hydrogen-bonded motif drives the self-assembly of the supramolecular network observed.