Department of Chemistry, Faculty of Sciences, Tlemcen University, Laboratory of Separation and Purification Technology, Box 119, Tlemcen, Algeria
*Email address of Corresponding Author: madidi13@yahoo.fr; ma_didi@mail.univ-tlemcen.dz

In this work, a novel room temperature ionic liquid1- methylimidazolium di(2-ethylhexyl) phosphonic acid was synthesized, characterized and tested as extractant in the Dysprosium(III) liquid-liquid extraction. The effects of parameters such as contact time, aqueous to organic phase’s volume ratio, metal concentration, ionic liquid concentration, pH levels, ionic strength, and temperature were reported.

The extraction efficiency of Dysprosium(III) ions was increased by increasing the concentration of ionic liquid and was negatively influencedby the presence of CH3COONa salt in the aqueous phase. The results showed also that theextraction process was feasible, spontaneous and most favourable at higher temperature.

¹State Ambient Air Quality Monitoring Programme (SAMP), Badrinarayan Barwale College, Jalna-431203, (MS) India.
²Department of Chemistry, Kohinoor College, Ta-Khultabad, Dist - Aurangabad (MS) (India)
³Department of Chemistry, Dr. Rafiq Zakaria College for Women, Aurangabad (MS) (India)
Email address of Corresponding Author: dobhalbs@gmail.com

In the present research work, the ambient air quality of Jalna City, India has been investigated by using air quality index (AQI). The paper examines the significance differences in monthly variation of air pollutants concentrations at S. P. Office residential area of Jalna, Maharashtra over a two year period are presented. Keeping in the need of monitoring of air pollution study was carried out particularly in the residential area. The study reveals that, the problem of air pollution (SO2, NOx, RSPM and SPM) is not so much serious at Jalna city. It may be because of strict government policy, efficient treatment plants, proper wastage disposal system etc. The biannual mean concentrations of all four pollutants measured at residential site were found within the permissible limits of Indian National Ambient Air Quality Standards (NAAQS).

¹Kakatiya Institute of Technology and Sciences, Hasanparthy, Warangal, Telangana 506015
²Mahatma Gandhi Institute of Technology, Chaitanya Bharati, Gandipet, Hyderabad-500075 Telangana, (India)
³CKM Arts and Science College, Warangal, 506006Telangana (India)
⁴Jawaharlala Nehru Techological University Hyderabad, Kukatpally, Hyderabad-500 085 Telangana (India)
E-mail: mtcharya@yahoo.com

Ethyl 4-(trifluoromethyl)-1H-imidazole-5-carboxylate (1) and 2- Chloro-3-nitro-6-methoxypyridine react each other to offer Ethyl 4- (trifluoromethyl)-1-(6-methoxy-3-nitropyridin-2-yl)-1H-imidazole-5- carboxylate (2). Compound 2 cyclised with Sodiumdithionate to form 2- Methoxy-7-(trifluoromethyl)imidazo[1,5-a]pyrido[3,2-e]pyrazin-6(5H)- one(3) which on chlorination offers 6-Chloro-2-methoxy-7-(trifluoromethyl) imidazo[1,5-a]pyrido[3,2-e]pyrazine(4). The structures of all synthesized compounds were confirmed by IR, NMR and mass spectral data.

¹Professor & Head Dept. of Chemistry MLSMCollege, Darbhanga
²At Dighiwet PD Lalbagh HPO Darbhang Bihar-846004
Email of Corresponding Author- mishrapm6@gmail.com

Ligands were synthesized by the simple condensation reaction of Salicylaldehyde with 7 – Methoxy naphthalene – 2 – amine. Ligand was estimated for elements by standard methods. Nitrate salts of divalent metals cobalt, nickel, copper and zinc were estimated volumetrically as well as gravimetrically. pH metric titration were carried out with the help
of digital pH meter. Stability constant of complexes of these metals with ligand synthesized were computed by Irving Rossoti technique modified by Calvin Bjerrum1.
The stability constant values of metal complexes were found to be in the order Cu(II) > Ni (II) > Co (II) > Zn(II).
The observed results is in agreement with the natural order proposed by Irving – William2.

¹P.G. Department of Chemistry, Nehru (P.G.) College, Chhibramau, Kannauj (U.P.) India

2P.G. Department of Mathematics, Nehru (P.G.) College, Chhibramau, Kannauj (U.P.) India

E-mail of correspponding author : sarvesh777@yahoo.com

In this paper, we prove a fixed point theorem for self mappings satisfying a new contractive type condition in a compact metric space. Fixed point theorem is useful in mathematical model for an adiabatic tubler chemical reactor which processes an irreversible exothermic chemical reaction. It is also useful in chemical similarity regarding substances as elements of a compact metric space.