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(4- Hydroxybenzaldehyde) - P - Phenylenediamine Zinc(Ii) Phosphate

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(4- Hydroxybenzaldehyde) - P - Phenylenediamine Zinc(Ii) Phosphate DOI: http://dx.doi.org/10.4314/gjpas.v20i1.4 GLOBAL JOURNAL OF PURE AND APPLIED SCIENCES VOL. 20, 2014: 17-24 COPYRIGHT© BACHUDO SCIENCE CO. LTD PRINTED IN NIGERIA ISSN 1118-0579 17 www.globaljournalseries.com , Email: [email protected] HYDROTHERMAL SYNTHESIS AND CHARACTERISATION OF BIS (4- HYDROXYBENZALDEHYDE) - P - PHENYLENEDIAMINE ZINC(II) PHOSPHATE SAMUEL S. ETUK, JOSEPH G. ATAI AND AYI A. AYI (Received 15 January 2014; Revision Accepted 14 March 2014) ABSTRACT The condensation of a para-phenylenediamine and two equivalent of para-hydroxybenzaldehyde in the presence of 2+ o Zn ions yielded a metallo-ligand of composition [ZnL2Ph(NH 3)2(H 2O) 2] I. Compound I melts at 126 C and is soluble in common organic solvents such as ethanol (C 2H5OH), dimethylformamide (DMF) and dimethylsulphoxide (DMSO). The scanning electron micrograph of compound I reveals a rectangular block crystals. The metalloligand synthesized was reacted with ortho-phosphoric acid under hydrothermal conditions at 105 oC to obtain colourless crystals of compound II with composition [Zn 4L2(HPO 4)6(H 2O) 3]. Compound II is insoluble in common organic solvents and melts above 300 oC. The structure of compounds I and II have been studied with the help of Infrared and UV- visible spectroscopy. The complexes show broad band absorption in the region 3760 – 3765.71 cm -1 due to the symmetric stretching vibration of the co-ordinated water molecule. KEYWORDS: Hydrothermal reaction, metalloligand, parahydroxybenzaldehyde, para-phenylenediamine, zinc phosphate. INTRODUCTION hydroxybenzaldehyde will condense with the amine groups of the paraphenylene diamine to give a new Metal organic framework (MOFs), also known functional group, the azo-methine group (-C=N), while as co-ordination polymers, are formed by the self the hydroxyl groups of the 4-hydroxybenzaldehyde left assembly of metallic centres and binding organic linkers are coordinated to the zinc metal ion. (Abu-Shandi, 2009; Dinca and Long, 2008; Halper, et al ., 2006). Owing to their permanent porosity, high EXPERIMENTAL surface area, large pore volume and adjustable size and Synthesis of Bis(4-hydroxybenzaldehyde)-p- shape, metal-organic framework (MOFs) have been phenylenediamine Zinc(II) complex extensively investigated in the past decades and have [ZnL 2Ph(NH 3)2(H 2O) 2] (I) shown highly promising applications in heterogeneous catalysis, gas separation, gas storage, bio-sensing etc. The resultant mixture with molar composition ZnO + (Wang et al ., 2009; Horike and Kitagawa, 2011). 2C 7H6O2 + C 6H4(NH 2)2 + 2HCl + 100H 2O + 200C 2H5OH The design of one, two or three dimensional crystalline network structure depends on choosing the Procedure: right combination of metal ions (connectors) and the In the synthesis of compound I, 1.22g of Para- organic ligands (linkers) to form a network structure hydroxybenzaldehyde (C 7H6O2) was dispersed in (Kitagawa, et al, 2004; Li, et al ., 1999). In this work, we aquoethanol solution made up of 55mL of ethanol and explore the use of 4-hydroxylbenzaldehyde and 7.2mL of water in a 250mL beaker. 0.43g of C 6H4 (NH 2)2 paraphenylenediamine as ligands to isolate a novel (paraphenylenediamine) was added to the mixture and metal organic framework with a potential application in stirred vigorously with magnetic stirrer, followed by the gas storage, separation and catalysis. addition of 0.324g of ZnO. 0.5mL of conc. HCl was Our aim is to offer beginners in the area of metal added as a mineralizing agent. The resultant mixture organic framework synthesis with the knowledge of was stirred for 15 minutes and then refluxed for 6 hours. using cheaper readily available alternative reagent to the The product was allowed to stand overnight before it costly 1,4- benzenedicarboxylic acid that is used as a was filtered. The filtrate was concentrated to half its house hold reagent in the isolation of metal-organic original volume to ease crystal growth. The concentrated framework. We anticipate the isolation of crystalline solid filtrate was covered with perforated aluminium foil and by condensing 4-hydroxy benzaldehyde with allowed to stand in a cupboard for two week. The paraphenylene diamine as ligand base on the basic crystals formed were filtered and dried at room chemistry that the carbonyl (C=O) group of the 4- temperature. Samuel S. Etuk, Department of Pure and Applied Chemistry, University of Calabar, Calabar, Cross River State, Nigeria. Joseph G. Atai, Department of Pure and Applied Chemistry, University of Calabar, Calabar, Cross River State, Nigeria. Ayi A. Ayi, Department of Pure and Applied Chemistry, University of Calabar, Calabar, Cross River State, Nigeria. 18 SAMUEL S. ETUK, JOSEPH G. ATAI AND AYI A. AYI Synthesis of Bis(4-hydroxybenzaldehyde)-p- RESULT AND DISCUSSION phenylenediamine Zinc (II) phosphate Zn 4L2(HPO 4)6(H 2O) 3 (II) The SEM images of compound I and II (Fig.1 and Fig. 2) reveal rectangular block crystals for compound I and The resultant mixture with molar composition: square plate for compound II . Compound I was insoluble [ZnL 2Ph(NH 3)2(H 2O) 2]+ 30DMF + H 3PO 4 + C 7H7NO 2 in water but dissolves instantly in ethanol, DMF and DMSO while compound II was insoluble in all the Procedure solvents that dissolve compound I. This can be Zn 4L2(HPO 4)6(H 2O) 3 was synthesized by interacting attributed to the differences in the amount of water [ZnL 2Ph(NH 3)2(H 2O) 2] with phosphoric acid, para-amino molecules co-ordinated to the metal centre and the benzoic acid and dimethyl formamide (DMF). 0.055g of strengths of the metal- ligand bonds in the two compound I was dissolved in 2mL of DMF in a 50mL compounds. The percentage yield and elemental beaker. This was followed by the addition of 0.1mL of compositions of the compounds calculated is presented H3PO 4 and 0.137g of p-amino benzoic acid under in Table 1. vigorous stirring. The stirring continued for 30 minutes Thermal measurement of compound I show a for homogeneity. The pH of the mixture was noted to be low melting point of 126 oC while compound II was 6. The resultant mixture was transferred into a 13mL thermally stable up to 300 0C. The low melting point of Teflon-lined autoclave and heated at 105 0C for five 126 0C for compound I is an indication of weak binding days. The resulting colourless single crystals were forces in the crystal lattice of the metal complex of filtered and dried at room temperature. compound I. The IR spectra provide valuable information Characterization regarding the nature of functional groups present in the Infrared spectroscopy (IR) compounds. The important IR vibrational frequencies for The Fourier Transform Infrared (FTIR) spectra the compounds Fig.4 and Fig.5 were recorded in the of the compounds under investigation were recorded region of 400 – 4000cm -1 on a KBr pellet as presented in between 4000 – 350cm -1 on Perkin Elmer FTIR Table 2. The complexes show broad band absorption in spectrophotometer. The compounds were prepared on the region 3760 – 3765.71 cm -1 due to the symmetric KBr disc at the Multidisciplinary Central Research stretching vibration of the water molecule co-ordinated Laboratory, University of Ibadan. to the metal atom (Chaplin, 2012). The band at 3438cm - 1 in complex II can be attributed to symmetric vibration UV-Visible spectroscopy of ννν(N-H). The absorption bands in the region 1592.78 – The UV-visible spectra were obtained at the 1615cm -1 indicates the formation of the azomethine range of 200 – 850nm on a UV-Visible group ννν(-C=N). It also indicates the reduction of the spectrophotometer by Unicam at University of Uyo double bond character of carbon-nitrogen bond of the Chemistry Central Laboratory. The sample (compound I) azomethine group (Usharani, Akila and Rajavel, 2012). was dissolved in ethanol then transferred into a cuvette The bands in the region 2885.71 - 3000cm -1 can be before being placed in the spectrophotometer for the assigned to the ν(-C-H) symmetric stretching vibration of detection of the absorbance. aromatic ring. The absorption band at 2371.14cm - 1indicates the disappearance of the primary amine of Melting point determination paraphenylene diamine as the azomethine group was The melting points of the compounds were formed. (Badawi et al., 2007). The absorption bands in -1 -1 measured using melting point apparatus (SMP 3 Biocote) the region 1905cm – 2028cm can be assigned to in- and capillary tube. The capillary tube was sealed at one plane bending mode of the aromatic (-C-H) group of end and the sample was introduced through the open compound I (Coates, 2000). The absorption bands at end of the tube. The samples in the tubes were inserted 1450cm -1 for compound I can be attributed to the into the melting point instrument and the temperature at symmetric vibration mode of ν(-C-N) unit. The bands in which the substances melted was noted. the region 1663cm -1 – 1669cm -1 is assigned to (-C=C-) symmetric vibration of the aromatic ring. The band at pH determination -1 1039cm is due to symmetric stretching of the PO 4 The pH of the reaction medium was measured group in complex II , while the band at 937cm -1 indicates using pH paper the P-O bending vibrational mode. The metal-oxygen (Zn-O) vibrational mode is observed in the region 501 – Solubility determination 591cm -1 and that of metal –nitrogen (Zn-N) is at 367cm - The solubility test of compound I and II were 1– 466cm -1. determined in water, ethanol, dimethylformamide (DMF) The formation of the Zinc (II) complexes was and dimethylsulphoxide (DMSO) at room temperature. further confirmed by UV-Visible absorption spectra. The absorption spectrum of the diamagnetic Zinc (II) Elemental Composition complex was recorded as C 2H5OH solution in the range The elemental compositions of compounds I of 200-850nm using quartz curvette of 1 cm path length and II were obtained from the proposed structures by shows that the absorption band observed between 250- calculation.
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