An adaptable heterometallic trinuclear coordination cluster in the synthesis of tailored one-dimensional architecture: Structural characterization, magnetic analysis and theoretical calculations

作者：Ghosh Soumavo; Girt Sanjib; Ghosh Ashutosh^*

来源：Polyhedron, 2015, 102: 366-374.

DOI：10.1016/j.poly.2015.10.014

• Crystal engineering
• Heterometallic
• Building block
• Magnetic exchange
• Density functional theory

A new trinuclear complex [(CuL alpha-me)(2)Co(bnz)(2)] (1) has been synthesized by using a metalloligand [CuL alpha-me] (H2L alpha-me = N,N'-bis(alpha-methylsalicylidene)-1,3-propanediamine, bnz = benzoate) with trans-coordinated syn-syn bridging benzoate group (1 kappa O:2 kappa O'). The syn-syn coordinative selectivity of carboxylate towards this trinuclear unit leads exclusively to the formation of linear coordination cluster. Such coordinative adaptability is exploited for supramolecular assembly using a dicarboxylate linker, terephthalate (tph, 1,4-benzenedicarboxylate) which yielded a tailored one-dimensional quasi-linear coordination polymer [(Cu alpha-me)(2)Co(tph)](n)center dot 2nH(2)O (2) having the linear trinuclear node. Isothermal magnetization measurement at 2 K suggests that both 1 and 2 posses S = 1/2 ground spin state indicating the presence of antiferromagnetic coupling at low temperature. The variable-temperature magnetic susceptibility measurements also reveal that both compounds are antiferromagnetically coupled with exchange coupling constants (J) of -17.3 and -9.2 cm(-1) for 1 and 2, respectively. The nature and magnitude of exchange interactions are further corroborated by density functional calculations.

• 出版日期2015-12-14