Hydrothermal Syntheses, Crystal Structure, and Magnetic Characterization of Two 3d-4f Heterometallic Coordination Polymers

Abstract

2) have been synthesized under hydrothermal conditions. In compound 1, 2D {[Gd 2 (CO 3 ) 2 ] 2+ } n sheets are connected by [Cu(pydc) 2 ] 2bridges, which give rise to the formation of a sandwichlike framework. Compound 2 exhibits a 3D framework constructed by Gd 4 clusters, Co 2 subunits, and pydc spacers. The solid-state dc magnetic measurements reveal antiferromagnetic behaviors of 1 and 2 in both compounds.

Magnetic lanthanide–transition-metal organic–inorganic hybrid materials: From discrete clusters to extended frameworks

“…Using 2,5-H 2 pydc, Yue and coworkers reported a 3D Ln-TM antiferromagnet with formula [Gd 4 Co II Co III ( 3 -OH) 3 ( 3 -O)(2,5-pydc) 6 (H 2 O) 5 ]·8H 2 O constructed from Gd 4 clusters and Co 2 subunits [95]. The Gd 3+ ions are clustered together by 3 -OH forming a tetrahedron, the Co 2+ and Co 3+ ions are bridged into a dinuclear subunit by carboxylate groups.…”

“…Temperature dependence of magnetic susceptibilities of the Gd 3+ and Er 3+ derivatives was measured from 300 to 2 K. Fitting the results with Curie-Weiss law generated the  value of −0.29 and −4.81, respectively, showing a weak antiferromagnetic interaction between metal ions. In addition, Yue and coworkers presented a similar structure formulated as [Gd 2 Cu(2,5-pydc) 2 (CO 3 ) 2 (H 2 O) 2 ]·2H 2 O constructed from [Cu(2,5-pydc) 2 ] 2− bridges pillared {[Gd 2 (CO 3 ) 2 ] 2+ } n sheets [95].…”

Fluorescence Properties Change of Lanthanide Coordination Polymers Dispersed in Mesoporous SBA-15 by Energy Transition Process

“…Lanthanides, with high and variable coordination numbers (6 B CN B 12) and flexible coordination environments, have led to a limited success in the design of molecular architectures with predetermined structures [25][26][27]. In the field of coordination polymers constructed by carboxylate ligands, much work is focused on lanthanide and transition metal coordination polymers constructed by multi-carboxylate ligands, such as benzene-1,2,4,5-tetracarboxylate, benzene-1,3,5-tricarboxylate, pyridine-2,3(5)-dicarboxylate, pyridine-2,6-dicarboxylate [28][29][30][31][32][33][34][35][36][37]. These multi-carboxylate ligands possess interesting features that are conducive to the formation of versatile coordination structures.…”

A series of three-dimensional 3d–4f heterometallic coordination frameworks based on pyridinedicarboxylic acid

“…In this context, the 2,5-H 2 pydc and 2,6-H 2 pydc ligands have proven to be good candidates for the construction of 3d-4f heterometallic coordination polymers with novel structures, such as [Er 4 (OH) 4 Cu 5 I 4 (ina) 6 [6][7][8][9][10]. Among these 3d-4f compounds, various factors tend to affect their properties, such as the nature of the counter anions of the metal salts, the geometric requirements of the metal atoms, the metal-to-ligand ratio, and the structure of the organic ligand.…”