Organically tuned white-light emission from two zero-dimensional Cd-based hybrids.

In this work, we report two zero-dimensional Cd-based hybrid compounds, denoted CdACP and CdODA, where the Cd atoms adopt tetrahedral geometry. The optical analysis reveals that these materials are classified as wide-gap semi-conductors which makes them suitable for optoelectronic applications. The photoluminescence analysis proves the wavelength dependent white-light emission behavior of the investigated materials. The structural-optical property studies show that, thanks to the heavy halide effect, the CdACP exhibits both fluorescence and room temperature phosphorescence through harvesting triplet states. Meanwhile, in contrast to CdACP, the white light emission from CdODA is purely fluorescence in nature. In fact, within CdODA, both C-H⋯π and N-H⋯N interactions facilitate the intramolecular proton transfer (ESIPT) between the different cations which leads to ultra-fast fluorescence through excited state ESIPT. Under sub-gap excitations, the inorganic sub-lattice is responsible for the blue-green emission through the STE mechanism, while the organic cations contribute by an intense red emission.

Spectroscopic and computational studies of the solid state photophysical properties of a biscoumarin dye.

The solid state photophysical properties of the 3,3'-paraphenyl bis[6,8-dimethoxy-2H-chromen-2-one] symmetrical biscoumarin material were investigated by optical spectroscopy techniques and by theoretical calculations. Vibrational analysis using IR absorption and Raman scattering techniques carried out together with DFT theoretical calculations have confirmed the structure of this biscoumarin. The geometry optimization using different functionals reveal a nonplanar equilibrium structure with a dihedral between the phenyl and the pyran rings of about 142°. The UV-Visible absorption measurements and the TDDFT simulation show that this biscoumarin is characterized by a bicomponent feature resulting from ππ* electronic transitions and Intramolecular Charge Transfer (ICT). Solid state photoluminescence showed a bright blue-green emission at 506 nm with a large stokes shift estimated at 146 nm, and the temperature dependence study of this emission reveals two thermal evolution regimes. Finally, these good optical properties, as well as the stability of the emission, make this biscoumarin dye of potential interest for optoelectronic applications.

Crystal structure of di-µ-chlorido-bis-[di-chlorido(l-histidinium-κO)cadmium(II)].

In the title compound, [Cd2(C6H9N3O2)2Cl6], the coordination polyhedra around the CdII cations are distorted trigonal bipyramids. Two of the chloride ions (one axial and one equatorial) are bridging to the other metal atom, leading to a Cd⋯Cd separation of 3.9162 (4) Å. The O atom of the l-histidinium cation lies in an axial site. In the crystal, numerous N-H⋯Cl, N-H⋯O, C-H⋯O and C-H⋯Cl hydrogen bonds link the mol-ecules into a three-dimensional network. Theoretical calculations and spectroscopic data are available as supporting information.

Bis[tris(propane-1,3-diamine-κ(2) N,N')-nickel(II)] di-aqua-bis(propane-1,3-di-amine-κ(2) N,N')nickel(II) hexa-bromide dihydrate.

In the title compound, [Ni(C3H10N2)3]2[Ni(C3H10N2)2(H2O)2]Br6·2H2O, one Ni(2+) cation, located on an inversion centre, is coordinated by four N atoms from two ligands and by two water O atoms. The other Ni(2+) cation, located in a general position, is coordinated by six N atoms from three ligands. In both cases, the Ni(2+) cation has an octa-hedral coordination environment. The overall structural cohesion is ensured by three types of hydrogen bonds, N-H⋯Br, O-H⋯Br and O-H⋯O, which connect the two types of complex cations, the bromide counter-anions and the lattice water molecules into a three-dimensional network.

[The results of laparoscopic treatment of the gallbladder lithiasis. About 500 cases]. / Les résultats du traitement laparoscopique de la lithiase vésiculaire. A propos de 500 cas.

BACKGROUND: Laparoscopic cholecystectomy is at present the gold standard treatment of gallbladder lithiasis. AIM: Assesment of Laparoscopic cholecystectomy METHODS: Through a retrospective series of 500 laparoscopic cholecystectomies during a period going from January 1996 to March 2000, we tried to evaluate our experience by comparing our results to the literature data. RESULTS: There were 420 women and 80 men with a sex ratio of 0.19. Average age was 50 years. 16.2% of our patients were obese. 13 patients had a history of respiratory disease and 122 history of a cardiovascular pathology essentially arterial hypertension. All our patients benefited from at least one hepato-biliary ultrasound examination before the intervention. Antibioprophylaxy was administrated in 93.8% of cases. In 23 cases (4.6%), a conversion was necessary for different causes. We noted 11 surgical complications (2.2%) among which 2 required a surgical resumption, and 11 medical complications dominated by broncho-pulmonary infections. We had no death.

[Retro-peritoneal liposarcoma. About 5 cases and revue of literature]. / Le liposarcome rétro-péritonéal. A propos de 5 cas et revue de littérature.

Liposarcomas are malignant mesenchymatous tumors developed from elements constituting the greasy tissue in various stages of differentiation. It is one of the most frequent mesenchymatous sarcomas. Retro-peritoneum is a privileged site of development in 12 to 15% of cases. During 9 years, from 1994 till 2002, we have colligated and operated 5 cases of retro-peritoneal liposarcomas. Average age was 50 years (extremes 34 to 79 years) with a sex-ratio of 1.5. Diagnosis was late beyond 6 months. Abdominal pain and the appearance of an enormous mass (20 cm) were the revealing signs. No imagery method allowed to evoke the diagnosis. The cyto-puncture realized once, was not able to determine with precision the histological type. Immunohistochimy occupies nowadays an important place to classify a sarcoma. Large surgical resection realized in 5 cases did not allowed the complete ablation of the tumour in 3 cases considering the advanced loco-regional extension, which was at the origin of 3 recurrences. Well differentiated histological type was noted in 3 cases, myxoid type in a case and not differentiated type in a case.

[Duodeno-pancreatic trauma. About 14 cases]. / Les traumatismes duodéno-pancréatiques, à propos de 14 cas.

Through a series of 14 cases brought over a period of 12 years, we realized a retrospective, analytical and descriptive study of these traumatisms. We aimed to release recommendations to improve their management. It was 2 women and 12 men, whom mean age was 24.4 years (extremes: 50 and 60 years), divided into 10 pancreatic injuries, 2 duodenal injuries and 2 duodeno-pancreatic injuries. Etiology was dominated by traffic accidents 7 cases (50%). Trauma was closed in 13 cases (92%). Associated lesions were present among 13 patients (92%). The traumatism appeared by an urgent surgical abdomen among 9 patients, secondarily in 3 cases, tardily in 2 cases: a case of deep suppuration 3 months after a traumatism treated into ambulatory and a case of persistent ascites after a past unperceived traumatism. Abdominal ultrasonography was made among 4 patients. It allowed diagnosing only a case. Scanner was made among 4 patients. It allowed diagnosing all the cases. Only a patient was treated medically, it was a post-traumatic acute pancreatitis. Surgical treatment was made in 13 cases: conservative in 7 cases and radical in 6 cases. Follow-up was complicated in 11 cases (78%) and non-complicated in 3 cases. Mortality rate was 7.1%.

[Carcinoid tumors of the appendix. A report of 46 cases]. / Tumeurs carcinoïdes de l'appendice. A propos de 46 cas.

Carcinoïd tumors of the appendix are rare. The appendix constitutes the most frequent localization of these tumors. We studied of a retrospective way all cases that had an appendectomy in the service of general surgery of Sfax on a period of 7 years going from 1995 to 2001. During this period, 9584 patients had an appendectomy in our service. Among which, 46 cases (0.48%) of carcinoid tumor of the appendix have been diagnosed. In more than 95% of cases, patients were admitted due to acute appendicitis; but none of them had the signs of the carcinoid syndrome. The treatment was a simple appendectomy in 44 cases (95%). The right hemicolectomy was necessary in two cases, because of an invasion of the appendicular base in a case and a tumor greater than 2 cm in the other case. There is no reported case of lymph node or systemic metastasis. The authors discuss data in the literature and analyse the features of the clinical picture, diagnosis, and try to define a convenient attitude of treatment of these tumors.

[Acute rupture of hydatid cysts in the peritoneum: 17 cases]. / Rupture aiguë du kyste hydatique dans le péritoine. A propos de 17 observations.

OBJECTIVE: Specify the clinical and progressive characteristics of acute rupture of hydatid cysts in the peritoneum. METHOD: We retrospectively studied patients who had undergone surgery for a hydatid cyst (HC) of the abdomen between January 1990 and December 2000 and in whom the exploration had confirmed the diagnosis of acute rupture of a hydatid cyst in the peritoneum. RESULTS: Over this period of 11 Years, 970 patients had undergone surgery for hydatid cysts of the liver and the spleen, 17 of whom had presented an acute rupture of the hydatid cyst in the peritoneum, that is to say 1.75% of the cases. The mean age was 30 Years and sex ratio was 0.41. Rupture was secondary to a trauma in 6 cases and to an intense physical effort in one case. The clinical table was acute peritonitis in 14 cases, acute intestinal occlusion in one case, suggested anaphylactic shock in one case, and a non-complicated hydatid cyst in one case. Ultra-sonographic diagnosis was made in all the cases, but that of rupture in 12 cases only. No scans were performed. Intervention was decided on within a delay of less than 72 hours in 16 cases. Surgical treatment consisted in the treatment of the peritonitis, the ruptured hydatid cyst, the associated hydatid cysts in the liver and the spleen, and the hydatid cyst of the right lung in two cases. Post-operative follow-up was complicated in 4 cases with two deaths through septic shock. Distant follow-up was marked by a secondary peritoneal hydatidosis in a patient whom has not benefited from medical treatment. The latter, based on albendazole, was prescribed in 6 patients with satisfying results and a mean follow-up of 32 months. CONCLUSION: The therapeutic progress has improved the prognosis of ruptured hydatid cysts in the peritoneum. Secondary peritoneal hydatidosis is fundamentally enhanced by the delay in diagnosis and treatment and the absence of medical treatment. The optimal strategy is to treat the patients at the non-complicated stage of the hydatid cyst and, above all, prevent the hydatid infestation.