RESUMO
New three-dimensional spin crossover (SCO) coordination polymers systematically constructed by the novel building unit [AgI 2(CN)3], FeII(3-Br-5-CH3pyridine)2[AgI 2(CN)3][AgI(CN)2] (1), FeII(3-Br-5-Clpyridine)2[AgI 2(CN)3][AgI(CN)2] (2), and FeII(3,5-Brpyridine)2[AgI 2(CN)3][AgI(CN)2] (3), have been synthesized and characterized. The bismonodentate binuclear [Ag2(CN)3]- and mononuclear [AgI(CN)2]- units and FeII atoms assemble to form a 3D network structure. The structures of 1-3 are crystallographically identical, which made up the triply interpenetration combined with complicated intermolecular interactions including Ag···Ag, Ag···X (pyridine substituents) and π-stacking interactions. Magnetic and differential scanning calorimetry studies were performed for 1-3. These compounds display a similar SCO behavior, while the critical temperatures (T c) are shifted by the substituent effect. Due to the identical structures of 1-3, the order of T c clearly corresponds with the Hammett constant.
RESUMO
BACKGROUND: Thoracoscopic esophagectomy for esophageal cancer performed using two-lung ventilation in the prone position has many advantages, such as convenient anesthesia induction and maintenance, and good oxygenation. We examined the safety of surgery and anesthetic management by following chronological changes in intraoperative respiration and hemodynamics. METHODS: We focused on the most recent and consecutive 14 cases of thoracoscopic esophagectomy for esophageal cancer in the prone position performed from November 2010 until recently. We measured the following items by use of FloTrac system : cardiac index (CI), central venous pressure (CVP), mean arterial pressure, partial pressure of oxygen in arterial blood (PaO2), partial pressure of carbon dioxide in arterial blood (PaCO2), peak airway pressure (APmax), and tidal volume. RESULTS: No major changes were observed in CI, systolic blood pressure, and TV after the start of pneumothorax (statically not significant). Conversely, CVP increased immediately after pneumothorax (p < 0.05) and decreased almost to its original level thereafter. The mean APmax value was 18-20 cm H2O [mean increase, 4.2 cm H2O; (p < 0.05)]. The mean P/F ratio and mean PaCO2 were 244.4 and 48.3 mmHg, respectively, during artificial pneumothorax. CONCLUSION: No excessive increases in airway pressure or clear circulatory depressions were observed because of artificial pneumothorax under two-lung ventilation in thoracoscopic esophagectomy for esophageal cancer in the prone position. These results suggest that artificial pneumothorax under two-lung ventilation is beneficial for maintaining stable hemodynamics and oxygenation in thoracoscopic esophagectomy in prone position.
