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A new organic nonlinear optical material 4-Benzeneazoaniline (C 12 H 11 N 3 ) was synthesized by diazotization and diazocoupling mechanisms. Single crystal of 4-Benzeneazoaniline was grown by slow evaporation of methanol solution at room temperature. Transparent crystals with size up_to 13x4x4 mm 3 were obtained. Single crystal X-ray diffractometer was utilized to measure the unit cell parameters and to confirm the crystal structure. The structure of compound was further confirmed by FTIR, 1 H & 13 C NMR and mass spectral analyses. The UV-Vis-NIR result shows that the crystal has a sharp cut off at 220 nm and is nearly 75% transparent over a wide wavelength range enabling it for application in the UV region. The optical energy gap of 4-Benzeneazoaniline was found to be 3.4 eV. Thermal properties of crystals were investigated using thermogravimetric and differential scanning calorimetric analyses, which indicated that the material does not decompose before melting. The NLO test confirms the second harmonic signal generation in the sample.

Background: The aim of this study was to evaluate the clinical and laboratory characteristics, treatment modalities and outcome of children with Kikuchi’s disease.Methods: A retrospective cross-sectional study was conducted among all children, histopathologically diagnosed with KFD.  Clinical, laboratory data and treatment outcomes were analysed.Results: During the study period, 53 children histopathologically confirmed as KFD were enrolled in the study. There were 36 males and 17 females. The lymph node involvements were mostly cervical with bilateral predisposition (63.5%), firm (88%), matted (30.8%) and tenderness (38.5%). Fever, headache, vomiting, chills, myalgia and rash were other common presentations other than cervical lymphadenopathy. The associated laboratory findings include anemia (71.2%), leukopenia especially lymphopenia (31.4%), monocytosis (21.6%), thrombocytopenia (16.3%), elevated CRP (53.1%), ESR (83.7%), LDH (100%) and elevated liver enzymes. Most of the children were managed conservatively (49.1%). Corticosteroids were administered for (22.6 %) of patients. Recurrence occurred in 4 children (7.5 %) and 13 children (24.5%) had other associated diseases.Conclusions: KFD should be suspected in well children with febrile cervical lymphadenopathy, especially with leukopenia, monocytosis, and elevated CRP, ESR, LDH, Liver enzymes. KFD in children can have rarely atypical presentations and coexist with other diseases.