Sulfonate-Ligated Coordination Polymers Incorporating Paramagnetic Transition Metals: Sulfonate-Ligated Coordination Polymers Incorporating Paramagnetic Transition Metals

The functionalized linker SNDC (4,8-disulfonyl-2,6-naphthalenedicarboxylate) has been incorporated into 2D extended structures featuring Fe-II or Co-II. These materials are isostructural and exhibit coordination via both the carboxylate and sulfonate groups of the SNDC linker. The variable temperature magnetic behavior of the Fe-II and Co-II materials has also been measured. A simplified model of these systems implies weak (|J| < 5 cm(-1)) antiferromagnetic coupling, as is expected for a superexchange mechanism operating through the carboxylate paddlewheels. The combination of functionalized linkers, such as SNDC, with paramagnetic metal centers is a promising pathway towards functionalized materials, and the coordination polymers reported join a small class of known materials featuring SNDC.