52
L. Hirsi6aara et al. / Journal of Organometallic Chemistry 579 (1999) 45–52
31P chemical shift is 2–3 ppm higher for PS complex of
each metal than for PSS complex.
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The 31P coordination shift difference between mono-
substituted chromium complex 1 and chelated complex
2 is 14 ppm. The lower shielding of 2 can be explained
in terms of chelate ring contributions. The typical 31P
deshielding in phosphorus bound bidentate complexes
is about 25–32 ppm compared to the corresponding
monodentate structures [39]. It seems that deshielding
effect of phosphorus–sulfur chelate ring is smaller.
IR spectrum of 1 exhibits three CO-bands at
2062, 1983 and 1937 cm−1
,
very much like
[Cr(CO)5PPh3] (2066, 1988, 1942 cm−1) [40]. IR spectra
of tetracarbonyl complexes 2–7 exhibit four w(CO)
bands, as should be expected for cis-M(CO)4 complexes
[8]. Stretching frequencies are in the range 1869–2024
cm−1, being closely the same (95 cm−1) for PS and
PSS complexes slightly changing with metal (915
cm−1). No clear trend from metal to metal can be
observed.
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