Poly symmetric coordinates

In 1994, Riordan and coworkers1 have prepared monoanionic, acyclic borates of the form B(CH2SR)4, potentially C3l,-symmetric facecapping ligands. These molecules can be considered sulfur analogs of the versatile poly(pyrazolyl)borates. The thioether ligands described in this chapter provide a softer coordination sphere for metal ions and, sometimes, a different metal atom environment. 

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