Coordination compound of silver (I) nitrate and ethylenethiourea (etu) in 1 : 4 stochiometry have been reported [1]. Coordination compound A and B being silver (I) nitrite with etu and silver(I) nitrite with N,N'-diethylthiourea (detu) respectively, have never been done. The purpose of this study is to synthesize and characterize coordination compounds A and B. Synthesis of coordination compounds A with 1 : 4 and B with 1 : 2 ratio stoichiometry respectively. Both of synthesis was conducted in acetonitrile directly. The obtained compound characterized by using melting point, electrical conductivity measurement, Scanning Electron Microscopy Energy-dispersive X-ray spectroscopy (SEM-EDX), qualitative nitrite test, free energy calculation and structures prediction using Spartan'14 v1.1.0. Coordination compounds of A and B have been investigated that it had colorless needle and prism crystals, having the melting point of 189°C and 103-105°C, free energy of -289.2567 and -1182.8101 kJ/mol respectively. Electrical conductivity measurement and qualitative nitrite test showed that the obtained compound for A is ionic and for B is molecular. EDX analysis gave empirical formula prediction for two coordination compounds, where A is C 12 H 24 AgN 9 O 2 S 4 and for B is C 15 H 36 AgN 7 O 2 S 3 .

Acceptance of employees in each company is an activity that is always carried out in a certain period or incidentally. This recruitment process requires a decision-making process as well as other decision-making processes in different contexts. In the context of employee recruitment, a number of prospective employees submit themselves by providing all required files and they may also be tested in writing or interview. The method that I use in this study is using a weighted product and quantitatively calculated. From the results of the research that has been done is obtained the best candidates from 10 households. Based on the results of the research conducted where the selection of assessment weights can be developed with other criteria according to company needs, the use of the Weighted Product method is more accurate to obtain the calculation of criteria weight, the results of calculations using the Weighted Product method, by reference to interview test criteria, tests psychological test, health test, work experience, recent education, age and appearance, then 1 (one) prospective employee is chosen, named Sukirman who will become an employee at PT.Hi-Lex Indonesia.

Analytical methods are needed to elucidate modern and complex compounds as well as to describe their physical properties. The underlying principles of chalcogen chemistry as well as the natural abundance of chalcogen elements are the base of building many biological substances, including sophisticated materials for future applications. Thus, the need for modern and state-of-the art analytical methods and techniques to characterize them, is obvious. In this chapter, challenges in analytical methods for chalcogen compounds and materials, as well as some examples of natural or synthesized materials or their combinations, including biomaterials, are discussed. Modern methods for chalcogen compounds analysis and structural determination discussed include: UV-Visible and infrared spectroscopy (UV-Vis and IR), thermo analysis, electrochemistry, magnetic analysis, chromatography, X-ray methods (mostly XRF, XRD, and EDX), high-resolution microscopy (SEM and TEM), multinuclear NMR, computational analysis, and bioassay. Also, the historical background and nature of chalcogen elements, including reactivity and magnetic properties as well as thermal behavior, common compounds of chalcogen elements: organic and inorganic materials, complex chalcogen materials, will be briefly discussed.

Senyawa kompleks dari kadmium nitrat dan dppp belum pernah dilaporkan. Tujuan penelitian ini adalah mensintesis senyawa kompleks dari kadmium nitrat dan dppp dengan stoikiometri 1 : 1 dan menentukan strukturnya. Senyawa kompleks yang diperoleh adalah padatan kristal tidak berwarna yang memiliki bentuk balok dengan titik lebur 272-275 ˚C. Hasil uji daya hantar listrik dan uji kualitatif ion nitrat menunjukkan bahwa senyawa yang diperoleh merupakan senyawa molekuler. Analisis EDX menunjukkan rumus empiris C27H26CdN2O6P2. Senyawa yang diterima adalah [Cd(ONO2)2(dppp)] dengan struktur tetrahedral terdistorsi dan energi bebas per ikatan-47,5 kJ/mol.

Cadmium (II) halides with N,N'-diethylthiourea (detu) ligands at a stoichiometry of 1: 2 tend to form molecular complexes [Cd(detu)2X2] with a distorted tetrahedral geometry at the central atom. Generally, these complex compounds are prepared by the conventional method of reflux for 4 hour. The use of ultrasonic waves for complex synthesis can be an alternative to make the reaction time more efficient and environmentally friendly. The aim of this study was to synthesize and characterize complex compounds from CdBr2 and detu ligands using the ultrasonication method that have not previously reported. The synthesis of complex compounds was carried out by reacting CdBr2 and detu (1:2) in methanol solvent. In the synthesized compounds, a melting point test, electrical conductivity test, Fourier Transform Infrared (FTIR), Scanning Electron Microscope-Energy Dispersive Xray (SEM-EDX), qualitative test of bromide ion and calculation of free energy using Spartan'14 software were carried out for the complex structure prediction. The complex compound resulted has colorless needle crystals with a melting point of 93-94°C. The results of the EDX analysis provide the empirical formula C10H24CdBr2N4S2. The electrical conductivity test data and the bromide ion qualitative test proved that the synthesized complex compound was a molecular complex compound with the molecular formula [Cd(detu)2Br2]. The complex compound has two possible structures, namely a distorted tetrahedral and a square planar. Free energy calculations showed that complex compounds with a distorted tetrahedral structure and a square  planar have free energies of -527.5574 kJ/mol and -408.7424 kJ/mol, respectively.