Synthesis, Crystal Structure and Magnetic Behaviour of Two 1‐D Chain Manganese‐Nitroxide Complexes Bridged by Isophthalate Anions

Abstract

Two one‐dimensional (1‐D) chain manganese‐nitroxide complexes {[Mn(NIT4Py)2(ip)(H2O)2]·4H2O}n (1) and [Mn(IM4Py)2(ip)(H2O)2]n (2) (NIT4Py = 2‐(4′‐pyridinyl)‐4,4,5,5‐tetramethylimidazoline‐1‐oxyl‐3‐oxide, IM4Py = 2‐(4′‐pyridinyl)‐4,4,5,5‐tetramethylimidazoline‐1‐oxyl and ip = isophthalate anion) have been synthesized and characterized by elemental analyses, IR spectrum and electronic absorption spectra. Complex 1 was structurally characterized and it crystallizes in neutral 1‐D chains where MnII nitroxide units [Mn(NIT4Py)2(H2O)2] are linked by isophthalate anions. The magnetic measurements show that complex 1 exhibits antiferromagnetic couplings, while complex 2 exhibits ferromagnetic interactions between the MnII ion and the nitroxide radicals.

Syntheses, Crystal Structures, and Magnetic Properties of Three 1D Chain Metal–Nitroxide Complexes Bridged by ­Flexible Dicarboxylate Anions

“…Recently, the use of organic bridging ligands linking the metal–nitroxide units has attracted much interest with the expectation of more fascinating results 13–15. The rigid phenyldicarboxylic acids, that are isophthalic and terephthalic acid, have been widely investigated in order to design coordination polymers of metal‐nitroxide complexes 16–19. This is because the dicarboxylate ligands present very rich coordination chemistry with good binding ability and diversity to generate extended architectures with dimensionalities ranging from 1D to 3D arrangements.…”

Substituent effect on the assembly of coordination polymers containing isophthalic acid and its derivatives

“…This strategy is crucial in controlling the structures and tuning the properties of CPs. [7][8][9][10][11] A lot of CPs containing isophthalic acid [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] or its derivatives, [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] with or without nitrogen heteroaromatic ligands, have been reported recently. However, systematic studies on the influence of the substituents on the structures of CPs are rare.…”