Novel rhenium(iii, iv, and v) tetradentate N2O2 Schiff base mononuclear and dinuclear complexesCCDC 933550933554. For crystallographic data in CIF or other electronic format see DOI: 10.1039/c3dt51198g

• Main Authors: Rotsch, David A, Reinig, Kimberly M, Weis, Eric M, Taylor, Anna B, Barnes, Charles L, Jurisson, Silvia S
• Format: Article
• Language: English
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/c3dt51198g

Reaction of (Bu 4 N)[ReOCl 4 ] with the tetradentate Schiff base ligand ,-[(1,1-dimethylethylene)dinitrilo]di- o -cresol (sal 2 ibnH 2 ) yields cis -[Re V OCl(sal 2 ibn)], which quickly forms trans -[-O(Re V O(sal 2 ibn)) 2 ] in solution. The dinuclear complex can also be isolated by the addition of base (Et 3 N) to the reaction mixture. Conversely, the mononuclear complex can be trapped as cis -[Re V O(NCS)(sal 2 ibn)] by addition of (Bu 4 N)SCN to the reaction mixture. Reduction of cis -[Re V O(NCS)sal 2 ibn] with triphenylphosphine gives the rare trans -[Re III (NCS)(PPh 3 )(sal 2 ibn)] and unique -oxo Re( iv ) dimer trans -[-O(Re IV (NCS)(sal 2 ibn)) 2 ]. All of the complexes were characterized by 1 H and 13 C NMR, FT-IR spectroscopy, electrospray ionization mass spectrometry (ESI-MS), cyclic voltammetry and single crystal X-ray diffraction. Rare examples of a water stable Re( v ) complex ( 3 ), monophosphinated Re( iii ) ( 4 ), and novel dinuclear Re( iv ) ( 5 ) with terminal thiocyanates.