Electronic Supplementary Information for Dalton Transactions This journal is © The Royal Society of Chemistry 2007 1 Electronic Supplementary Information for Dalton Transactions This journal is © The Royal Society of Chemistry 2007 Supporting Informations for: Silver(I)-organophosphane complexes of electron withdrawing CF 3 - or NO 2 - substituted scorpionate ligands Maura Pellei, a Simone Alidori, a Grazia Papini, a Giancarlo Gioia Lobbia, a John D. Gorden, b H. V. Rasika Dias, b and Carlo Santini a a Dipartimento di Scienze Chimiche, Università di Camerino, via S. Agostino 1, 62032 Camerino (MC), Italy. E- mail: carlo.santini@unicam.it b Department of Chemistry and Biochemistry, Box 19065, The University of Texas at Arlington, Arlington, Texas 76019-0065. E-mail: dias@uta.edu Material and methods Elemental analyses (C,H,N,S) were performed in house with a Fisons Instruments 1108 CHNS-O Elemental Analyser. Melting points were taken on an SMP3 Stuart Scientific Instrument. IR spectra were recorded from 4000 to 100 cm -1 with a Perkin-Elmer System 2000 FT-IR instrument. IR annotations used: m = medium, mbr = medium broad, s = strong, sbr = strong broad, sh = shoulder, w = weak. 1 H-, 13 C-, 19 F- and 31 P-NMR spectra were recorded on a Oxford-400 Varian spectrometer (400.4 MHz for 1 H, 100.1 MHz for 13 C, 376.8 MHz for 19 F, and 162.1 MHz for 31 P). Chemical shifts for 1 H NMR spectra are relative to internal Me 4 Si. 13 C NMR spectra were run with 1 H decoupling, and the chemical shifts are reported in ppm vs Me 4 Si. 19 F NMR and 31 P NMR chemical shifts were referenced to an external CFCl 3 and an 85% H 3 PO 4 standard, respectively. The 31 P NMR spectroscopic data were accumulated with 1 H decoupling. NMR annotations used: d = doublet, dd = double doublet, dbr = broad doublet, m = multiplet, mbr = broad multiplet, s = singlet, sbr = broad singlet, t = triplet. Electrospray mass spectra (ESIMS) were obtained in positive- or negative-ion mode on a Series 1100 MSD detector HP spectrometer, using an acetone mobile phase. The compounds were added to the reagent grade methanol to give solutions of approximate concentration 0.1 mM. These solutions were injected (1 μl) into the spectrometer via a HPLC HP 1090 Series II fitted with an autosampler. The pump delivered the solutions to the mass spectrometer source at a flow rate of 300 μl min -1 , and nitrogen was employed both as a drying and nebulizing gas. Capillary voltages were typically 4000 V and 3500 V for the positive- and negative-ion mode, respectively. Confirmation of all major species in