Structural difference due to intramolecular stacking interactions in dinuclear rhodium(III) complexes [{Rh(η5-C5Me5)(L)}2]n+containing pyrimidine-2-thionate and related ligands

Self-assembling reactions between [Rh(η5-C5Me5)(H2O)3]2+and pyrimidine-2-thionate(pymt) or related ligands[L; mpymt = 4-methyl-pyrimidine-2-thionate(1-), dmpymt = 4,6-dimethylpyrimidine-2-thionate(1-), apymt = 4-aminopyrimidine-2-thionate(1-), dapymt = 4,6-diaminopyrimidine-2-thionate(1-), or mpol = 2-sulfanyl-3-pyridinolate(2-)] were carried out and the products characterized by UV/vis, NMR spectroscopy, electrospray ionization mass spectrometry, and crystal structure analysis. All products are dinuclear rhodium(III) complexes of [{Rh(η5-C5Me5)(L)}2]n+: three crystal structures with mpymt, dmpymt and mpol were determined. The mpymt and dmpymt ligands co-ordinate through a 1κ2N,S:2κS mode and the two pyrimidine rings are located in cis position,whereas mpol adopts a five-membered chelating mode with 1κ2S,O:2κS and the two pyrimidine rings are located in trans position. Such structural difference can reasonably be explained by the　intramolecular stacking interaction between the two bridging ligands

Giant pedunclated lipoma of the esophagus: A case report

Introduction: Although Esophageal lipoma is extremely rare and pathologically benign, surgical excision of the lipoma is recommended when symptomatic or uncertain biological behavior. In general, some of the esophageal lipoma has a stalk. The pedunclated non-invasive tumor can be removed by stalk ligation, which is either endoscopic or surgical approache. Therefore, the preoperative evaluation is essential. We herein present a case of a huge esophageal lipoma. Case report: A 82-year-old man, with a wet cough and dyspnea for 6 months, who had the huge mass that almost completely occupied the esophageal lumen, was referred to our institution for the treatment.We diagnosed the mass as non-invasive tumor that has a stalk at the close to the esophageal orifice, by the CT image using air injection into esophageal lumen. We performed excision of the pedunclated huge mobile mass by esophagotomy via right thoracic approach with use of endoloop. Pathological examination showed a lipoma. Conclusion: In conclusion, an adequate preoperative evaluation to identify the correct origin of the stalk is mandatory for a successful treatment. In order to do the adequate preoperative evaluation and successful surgery, our diagnostic method of CT image can be effective