What is even worse, it complicates subsequent handling of such data and makes life more difficult for Companies like Mestrelab specializing in off-line evaluation of NMR spectra. In an entry entitled Why aren't Bruker FIDs time corrected?, Carlos Cobas has shown on his NMR Analysis blog that Bruker NMR data acquired with recent digital receiver hardware exhibit a massive artifact which makes the starting portion of an FID look very funny - certainly not the way it should look according to any NMR textbook. But this summer I will set up an on-line table of record-breakers and every time somebody mails me a new entry, I will cite him/her. For example, what are the largest reported two-bond H-H or C-C or C-H or H-F couplings? My practical experience is not broad enough to tell you. The whole thing made me think that it would be fun to try and build a table of record-breaking J's between all kinds of nuclides. While with light nuclides the relativistic terms are a tiny correction, in heavy nuclides they become very large and dominant (for more details, read the Review by J.Autschbach. The fact that the J's between covalently bound heavy atoms are so large has to do with relativistic terms in the quantum mechanical expressions for scalar coupling. Their value is 139600 Hz, smaller than in di-mercury. In the introduction to their paper, the authors mention also the largest known one-bond heteronuclear scalar coupling reported by M.Maliarik, K.Berg, J.Glaser, M.Sandström and I.Tóth for the 195Pt and 205Tl pair in (NC)5Pt-Tl its value is 71060 Hz.Īnother interesting case is the tri-mercury ion 2+ in which the central mercury is different from the other two (A2B spin system) so that the one-bond J's can be observed [ R.J.Gillespie, P.Granger, K.R.Morgan and G.J.Schrobilgen, Inorg.Ĭhem. The record-breaking measurements were done by R.Malleier, H.Kopacka, W.Schuh, K.Wurst and P.Peringer in 2000 and might be actually out-of-date today. According to the exact pair of ether molecules used, the J between the two mercury nuclides varies quite a lot, so that its value in a "naked" di-mercury ion is still a mystery. In order to observe it one must break the ion's symmetry, which happens in some a-symmetric complexes of di-mercury with crown ethers. Of course, as Glenn points out (and as every student should know), when the two nuclides are truly equivalent, the J is not observable. It starts with the realization that the largest scalar coupling ever observed so far has the value of 284100 Hz (yes, over 284 kHz!) and occurs between the two equivalent 199Hg nuclides of the di-mercury 2+ ion. This permanent page contains January - June 2008 entriesĪ June 24 entry on Glenn Facey's blog reminded me of an old idea of mine which might become a collective project.
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prosecutors.See the running index for instructions how to cite/link an entry in this blog Kapoor had the items cleansed and repaired to remove any damage from illegal excavation, and then illegally exported them to the United States from their countries of origin, according to U.S. Some of the artifacts were recovered from Kapoor’s storage units in New York. They say Kapoor traveled the world seeking out antiquities that had been looted from temples, homes and archaeological sites. Another 33 objects were sent back to Afghanistan in April.Ĭourt papers filed in New York says Kapoor went to extraordinary lengths to acquire the artifacts, many of them statues of Hindu deities, and then falsified their provenance with forged documents. In June, the district attorney’s office returned more than two dozen artifacts worth $3.8 million to Cambodia as part of the investigation. Nancy Wiener sold looted items to major museums in Australia and Singapore, they said. The Shiva Nataraja bronze was sold by the mother of Nancy Wiener, a gallery operator who pleaded guilty in the case this month to charges of conspiracy and possession of stolen property, authorities said. The investigation has resulted in the recovery of 2,500 artifacts valued at $143 million and convictions of six Kapoor co-conspirators, Vance said. extradition request - used his Arts of the Past gallery in New York to traffic looted treasures from India and various countries in Southeast Asia. Stowaway Found in Plane's Landing Gear Compartment at Miami AirportĪuthorities say Kapoor - jailed in India and facing charges there pending a U.S.