r.e. chemical shift referencing for 31P in solution.
Hi all,
What's a recommended 31P chemical shift reference standard for small organic
molecules in D2O?
I see 85% H3PO4 at zero ppm is the most referenced. But doesn't the amount of
water present affect the 31P shift? (Sometimes I see just the acid given,
sometimes I see aqueous given (no specific amount), sometimes I see the acid
listed with D2O (no specific amount), the bottle of H3PO4 already states
85%, . . .).
In the NMR Encyclopedia (Vol 4, p. 2340, Table 2), I see listed PPh3 = -5.6
ppm, but no literature reference as to details (assuming room temperature? in
acetone-d6? still an okay external reference for organic molecules in D2O)?
I appreciate your assistance on this basic question.
Sincerely,
Yael
--
Yael S. Balazs
NMR Facility Manager
Faculty of Chemistry
Technion - Israel Institute of Technology
Haifa, Israel 32000
office phone: +972-4-829-3898
lab phone/messages: +972-4-829-3748
departmental fax: +972-4-823-3735
email: balazs_at_tx.technion.ac.il
Received on Mon Jun 17 2002 - 09:59:58 MST