OMS Letters
Dear sir, The fragmntaticm of the three following carq?lexes has been studied: acetylacetonato (dicarbonyl) rhcdium Rh(o3) (acac) -1; acetylacetomto (triphenylphosphine) ( c a r h y l ) rhodium Rh(c0) (Pph,) (acac) -2; p h e n y l a ~~~~t c m a t o (dicarbonyl) rhodium Rh (03) 2 (phcac) -3. Their structural fonmiLas are given below:
The redsurerents were done w i t h a ZAB-Hs double focusing instrument of reverse gametry (VG-Analytical) equipped w i t h a Ds2335 data system. The experimental conditions were: 70 eV ionizing electrons, source temperature 170 C, accelerating voltage of 8 kV. The direct probe inlet system w a s used and the heating temperature of the probe was adjusted t o provide the mst intense m1ecula.r ion for each ccmpound: 58 2 1, 198 L 2 and 110 f. 10 -1, 2, and 2, respectively. B, B/E and B2/E scans were taken under control of IS 2335 data system. The low resolution spectra w e r e registered a t 1000 resolution w i t h a scan speed of 3 s/decade. High resolution spectra were taken a t 10,000 resolution and a scan speed of 7 s/decade. Linked scan techniques were used to detect the metastable d w i t i o n reactions occuri n the f i r s t f i e l d free region of the instrument a t a scan rate of 4 s/decade. 0 0
C for CCCI[POUndS
The sarrp?les were dissolved in n-hexane and 2 pl were transfer& into the sample cup a t the tcp of the probe. The probe tenperatme was adjusted to the optimal value a t a heating rate of 2 OC/s.
In order to confirm the fragmentation mecharu 'sms, the elemental ccmposition of resolution. The results are given i n Table 1-3.
the mjor ians w a s detemined by exact mass m a s u r m t s a t high The fragmsmtation pathways after electron inpact were approached by linked scan techniques. The data reported above a l l o w us to propose the fragmsmtatim schemes for the impOrtant ions of these ccnplexes as shown i n Fig. 1-3 in w h i c h the abserved metastable transitians wxe denoted as m*. 0 1987 by John Wiley & Sons, Ltd.