Structure and magnetic properties of binuclear Cu2(O2CCHCHCH3)4(DMF)2: a carboxylate-bridged Cu(II) spin dimer

Structural and magnetic properties of spin-1/2 dimer compound Cu2(IPA)2(DMF)(H2O) with a large spin gap

“…For a comparison, the highest value of spin gap is found to be reported for SrCu 2 O 3 (∆/k B 420 K) 7 among the inorganic compounds and for Cu(IPA)(H 2 O) (∆/k B 410 K) among the metal-organic compounds. 30 Thus, the value of spin gap found for Cu 2 (IPA) 2 (DMF)(H 2 O) is nearly same in magnitude to the highest values reported so far.…”

“…] n , and Cu 2 (O 2 CCH=CHCH 3 ) 4 (DMF) 2 show singlet ground state with a spin gap of ∼ 342 K, ∼ 375 K, ∼ 333 K, and ∼ 220 K, respectively. 29,30 The compound tetrakis(µ 2 benzoato-O,O )-bis(dimethyl sulfoxide)dicopper(II) which also has paddle-wheel like dimer units but with a different ligand show one-dimensional character with a exchange coupling J/k B 405 K. 31 It undergoes a FM ordering at T C 9 K. Recently, another compound Cu(IPA)(H 2 O) is reported to have paddlewheel like spin dimers coupled through IPA ligand, similar to our compound. The crystal lattice forms a Kagomé structure with a very large spin gap of ∆/k B 410 K. 32 From the above examples it is clear that though all these compounds are having paddle-wheel like spin dimers but different connecting ligands between dimers lead to diverse ground states.…”

Magetic interactions in a new copper(II) carboxylate complex

“…These four groups mediate an AFM interaction between Cu 2+ ions in the dimer. The distance between Cu 2+ ions in dimer (0.264 nm) and the measured coupling constant J 1 ¼ À320 K are similar to the values obtained from other studies on similar structures [1][2][3][4].…”

“…Numerous dimeric copper II [Cu(II)] compounds with different non-magnetic ligands have been studied recently [1][2][3]. The strong antiferromagnetic interaction usually arises between Cu(II) ions.…”

Exchange couplings and quantum phases in two dissimilar arrays of similar copper dinuclear units

“…A large fraction of the studies of DUs were done for units with carboxylate bridges. 1,2,[12][13][14][15][16][17][18] Attention has also been paid to the effect of weak exchange interactions J′ interconnecting finite 5,19,20 and infinite [21][22][23][24] arrays of DUs in a molecule or a periodic structure. The periodic structures give rise to travelling spin excitation (triplons) [25][26][27] transforming the finite quantum dinuclear units into infinite collective systems with quantum many-body effects modifying the magnetic properties and showing the fascinating properties of molecular magnets, including quantum phase transitions, 28,29 Bose-Einstein condensation, 27,29 quantum spin ladders 30 and more.…”