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Development of Organic Linkers and Functionalized Metal Coordination Complexes: An Industrial Nose

Thesis Info

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Author

Mansab, Saira

Program

PhD

Institute

Fatima Jinnah Women University

City

Rawalpindi

Province

Punjab

Country

Pakistan

Thesis Completing Year

2019

Thesis Completion Status

Completed

Subject

Environmental Sciences

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/12573/1/PhD%20thesis%20Red%20print.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676724621769

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Currently, the scientists are directing their research in finding solutions for the risks associated with unanticipated and undetected chemical pollutants. The major efforts are focused on early identification and investigation of pollution issues before they worsen the environment and human health. In this aspect, new metal coordination complexes are explored as most sustainable materials. The efficiency can be tailor-made in terms of surface area, pore volume and conjugation of ligands for diverse sensing and remedial applications. The present research was aimed to synthesize single and mixed ligand coordination complexes based on nitrogen containing ligands (imidazole, triazole, pyridyl) with understanding that nitrogen has a significant role in binding with organic moiety. A series of coordination complexes were synthesized where both ligands were coordinated with zinc followed by post-synthesis modification for incorporation of amine groups. The assessment of structural surface and bulk properties was undertaken with a range of analytical techniques. Results of 1H-NMR identified structural modifications due to functionalization induced by amine moiety. The optimum (72% and 76%) incorporation was obtained for ethyl amine in imidazole and triazole, respectively. Further, binding of primary and secondary ligands in different ratios developed unique structures for mixed ligand coordination complexes. Another characteristic of complexes was binding of functional groups at amine position indicated by disappearance of distinctive (3000-3400cm-1) peak in FTIR analysis. The significance of the synthesized materials was their high structural and thermal stability due to metal coordination. However, incorporation of larger amine groups resulted in decrease in surface area. The synthesized single ligand and conjugated complexes were tested for adsorption and sensing potential against herbicide and nitro compounds, respectively. The highest (79%) adsorption efficiency was monitored for (Zn(NH-TBA)2Eth(NH2)2), due to maximum number of amine groups. The well-known adsorption isotherms and kinetics equation suggested that process pre-dominantly followed physio-sorption mechanism sequentially from sub-monolayer to multi-layered structure. Intra-particle model expressed three phase diffusion, via external surface, micropores and mesopores of the materials. The chemical sensing potential of conjugated (mixed ligand) complexes was determined through Photoluminescence studies. A blue shift with optimum intensity was recorded for complexes in comparison to ligand depicting the significant sensing for nitro compounds. Further, maximum quenching efficiency was noted for 4,4''- dibenzohydrazobenzene and nitroaniline, proposing collisional and static quenching mechanism. The electrical conductance of synthesized complexes was explored using impedance. An important aspect revealed was the charge transfer and diffusion resistance and radius of semicircle of Nyquist shifted to higher frequency due to increase in heterogeneity. These results were elaborated further by Randles-Ershler equivalent circuit model. The research submitted encouraging results opening a wide application window for the synthesized single-ligand and conjugated coordination complexes. The novelty of functionalization in complexes was also offered. The study testified the potential and efficacy as adsorbents, biosensors and semiconductors. The study concludes that these materials offer great capacity for commercial viability and suitable candidate for environmental remediation and luminescence-sensing applications.
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سعیدہ صبا سیالکوٹی

سعیدہ صبا سیالکوٹی(۱۹۱۹ء۔۲۰۰۲) کا اصل نام احمد بی بی ہے۔ آپ پسرور میں پیدا ہوئیں ۔آپ کے بڑے بھائی عبرتؔپسروری معروف شاعر تھے۔(۷۰۴)

’’گلدستہ صبا‘‘ سعیدہ صبا کا واحد شعری مجموعہ ۱۹۹۶ء میں شائع ہوا۔ حمد و نعت،اتحاد اُمت ،قومیت ،دینِ اسلام ،اور حالات حاضرہ ان کی شاعری کے اہم موضوعات ہیں۔ آپ کے دل میں امت مسلمہ کا بہت درد تھا۔ جس کا اظہار ان کے مجموعہ ہائے کلام کے صفحات میں جگہ جگہ ملتا ہے۔

ان کی نظم میں لطافت و سلاست پائی جاتی ہے۔ وہ کسی بھی تاثر کی منظر نگاری نہایت جاذب پیرائے میں کرنے پر بڑی قدرت رکھتی ہیں۔حضورؐ سے سچی محبت کی وجہ سے آپ نے متعدد مقدار میں نعتیں لکھیں۔ ایک وقت ایسا تھا جب ان کا مقصود شاعر ی سے کہیں زیادہ مدحتِ رسول عربیؐ تھا۔ آپ کی شاعری کے بارے میں احسان اﷲ ثاقب رقم طراز ہیں:

آپ اپنے منفرد اسلوب میں الفاظ کا جادو جگاتی ہیں اور مشکل سے مشکل مضامین کو بھی آسانی سے ادا کرنے کی مہارت رکھتی ہیں۔ حمد،مناجات،نعت،سلام ،قومی واقعات اور گھریلوتقریبات آپ کے دل پسند موضوعات سخن ہیں۔ آپؐ کی شاعری رضائے الٰہی کے حصول ،رسولؐ خدا کی خوشنودی ،ملی احساس اور معاشرتی فلاح و بہبود کے جذبات سے لبریز ہے۔(۷۰۵)

صبا کا نعتیہ کلام ان کے دل سے نکلی ہوئی آواز ہے۔ انھوں نے آیات قرآنی کاسلیس اور سادہ زبان میں منظوم ترجمہ بھی کیا ہے۔وہ قرآن اور خالق قرآن سے محبت کرتی ہیں۔ وہ عشقِ رسولؐ کا مجسمہ ہیں۔ وہ اس بات کا شعور رکھتی ہیں کہ روح کے سکون کے لیے عشقِ حقیقی اور عشقِ رسولؐ کا ہونا ضروری ہے کچھ نعتیہ اشعار اور منظوم قرآنی آیات ملاحظہ ہوں:

وہ دل جو دور ہیں...

عصر حاضر میں مسلم معاشروں کو درپیش نظریہ الحاد کا فکری چیلنج اور اسلامی تناظر میں اس کا حل

Ideological Challenges of Atheism to the Muslim Societies and their Solutions from Islamic Perspective It’s a matter of fact that Muslim Societies are facing many socio-political and religious challenges within contemporary dominant waves of thought. One of the serious challenges being faced by the Muslim in the current scenario is Atheism. Although in past era, the Atheism couldn’t become influential with general acceptance of commoners but recently, the ideology of Atheism is spreading fast with statistically reported impact on all religions and civilizations. Atheism is a lack of belief in God, gods or any supernatural being along with the rejection of belief that any deities exist. The philosophy of atheism is nothing new, but it has changed its manifestations over a period. This is obvious that Atheism has now become a serious challenge ideologically and morally for Muslim societies. We are living in a fast-changing society, where preservation of Islamic belief is a challenging task particularly for the new young generation and modern educated lot. Atheists use every possible and available mean and tool for preaching their thoughts and beliefs i.e. Print media, electronic media and above all social media. In this context, this study will explore the questions that; what are the effects of Atheism in Muslim Societies and what is its solution in Islamic perspective? Analytical research methodology will be used in this study. This study perceives that the public and private sector universities are the soft target of Atheism. There is suggested legal, ethical & ideological mechanisms to protect Muslim Societies from threat of Atheism.

Integrated Nitrogen Management With and Without Beneficial Microbes in Spring Maize and its Carry over Effect on Subsequent Mung Bean

The effectiveness of beneficial microbes in improving soil fertility and crop productivity may vary with soil organic matter and nitrogen contents. For this purpose, field trials were conducted at the Agronomy Research Farms of the University of Agriculture Peshawar to evaluate the effect of beneficial microbes, organic and inorganic N ratios and N levels in spring maize and mung bean cropping system in semi-arid alkaline calcareous soil condition of Peshawar during 2014 and 2015. Maize was sown in spring followed by mung bean in summer. The experiment was consisted of three factors i.e., beneficial microbes (BM) (with BM and without BM), organic and inorganic N sources (R) (0:100, 25:75, 50:50, 75:25 and 100:0), desired nitrogen (N) levels (100, 150 and 200 kg N ha-1) and control. The experiment was carried out in randomized complete block design (RCBD) with 3 replications. Plot size was 4.2 m x 4 m having six rows in maize and 12 rows in subsequent mung bean. Row to row distance for maize and mung bean was 70 and 35 cm respectively. Mung bean was sown without application of the cited treatments for carry over only. Based on the average results of the two years, BM significantly enhanced plant height (220 cm), SPAD value (62.53), days to tasselling (63.3 d), silking (66.9 d), maturity (101 d), leaf rea (437 cm2), LAI (3.47), ears m-2 (7.0), grains ear-1 (576), thousand grains weight (269 g), biological yield (16543 kg ha-1), grain yield (5438 kg ha-1), harvest index (32.9 %), soil organic matter (1.04 %), stover N (0.77 %), grain N (1.64 %), grain protein (10.23 %), stover N uptake (76.3 kg ha-1), grains N uptake (89.8 kg ha-1), total N uptake (127 kg ha-1) and N use efficiency (24.5 kg grains kg-1 N supply). Higher soil mineral N (47.7 mg kg-1) was observed without application of BM. Application of organic and inorganic N in 50:50 R significantly improved plant height (222 cm), SPAD value (63.68), days to tasselling (63.1 d), days to silking (66.9 d), days to maturity (100 d), leaf area (456 cm2), LAI (3.61), ear m-2 (7.0), grains ear-1 (554), thousand grains weight (266.3 g), biological yield (16792 kg ha-1), grain yield (5732 kg ha-1), harvest index (34.1 %), stover N (0.81 %), grain N (1.68 %), grain protein content (10.5 %), stover N uptake (81.06 kg ha-1), grains N uptake (97.17 kg ha-1), total N uptake (131.9 kg ha-1) and N use efficiency (25.9 kg grains kg-1 N supply). Higher soil organic matter (1.21 %) was observed with application of full dose of N applied from organic source. Soil mineral N (50.2 mg kg-1) and soil total N (0.085%) were observed with application of organic and inorganic N in 75:25 R. Application of N @150 kg ha-1 significantly increased SPAD value (61.9), leaf area (445 cm2), LAI (3.59), ears m-2 (6.9), grains ear- 1 (548), thousand grains weight (266.2 g), grain yield (5228 kg ha-1), harvest index (32.7 %), grain N (1.63 %), grain protein (10.19 %) and grains N uptake (85.82 kg hav 1). Higher plant height (220 cm), days to tasselling (63.9 d), silking (67.3 d), and maturity (102 d), biological yield (16589 kg ha-1), soil organic matter (1.21 %), soil total N (0.082%), stover N (0.89 %), stover N uptake (93.13 kg ha-1) and total N uptake (144.03 kg ha-1) were observed with application of 200 kg N ha-1. Similarly, N use efficiency (26.13 kg grains kg-1 N supply) were recorded with application of N @ 100 kg ha-1. In mung bean, higher pods m-2 (214), grains pod-1 (11), thousand grains weight (50.8 g), grain yield (918 kg ha-1), biological yield (5896 kg ha-1) and harvest index (17.12 %) were observed with the residual effect of BM. However, more pods m-2 (231), grains pod-1 (11.2), thousand grains weight (50.8 g), grain yield (927 kg ha-1) and biological yield (6141 kg ha-1) were obtained with the residual effect of organic and inorganic N in 75:25 and 50:50 R while higher harvest index (17.7 %) was observed with organic and inorganic N in 50:50 R. Higher grains pod-1 (10.8), thousand grains weight (51.24 g), grain yield (917 kg ha-1) and biological yield (5935 kg ha-1) were observed with the residual effect of 150 kg N ha-1 while higher harvest index (17.12%) was observed with residual effect of 100 kg N ha-1. On the basis of above results, it was concluded that BM in combination with N @ 150 kg N ha-1 in organic and inorganic ratio of 50:50 performed better and are, therefore, recommended for higher productivity in spring maize-mung bean cropping system in the agro-climatic conditions of Peshawar Pakistan.