200 research outputs found
A half-century of metal and metalloid-containing polymers
No full textAlaa S. Abd-El-Aziz ... [et al.]; Includes bibliographical references and indexes.; Editor, Alaa S. Abd-El-Aziz, is currently President of the University of Prince Edward Island.Source type: Electronic(1
Amid the COVID-19 Pandemic, Social Media Usage and Food Waste Intention: The Role of Excessive Buying Behavior and Religiosity
No full textDespite being a religious country, the Kingdom of Saudi Arabia (KSA) ranks among the world’s worst food wasters. Social media usage (SMU) and changes in customers’ behavior, such as excessive buying, are some of the main influences of food waste. This paper examined the impact of SMU on food waste intention (FWI) with the mediating role of religiosity and excessive buying behavior amid the coronavirus (COVID-19) pandemic. A self-administered questionnaire was completed by 1250 restaurant customers in KSA. The study results employing structural equation modeling (SEM) demonstrated a significant negative impact of customer religion on the intention of food waste. Nevertheless, SMU fosters excessive buying, which in return results in a high FWI. The results also demonstrated that excessive buying behaviors partially mediate the influence of SMU and religiosity on the intention of food waste. The findings have numerous implications for policymakers, academics, and restaurant professionals
Innovative approach to the synthesis of sulfides and their corresponding sulfones.
No full textNucleophilic arom. substitution (SnAr) of cyclopentadienyliron-arene complexes with various aliph. or arom. dithiols followed by oxidn. and/or photolysis is presented as a viable route to the prepn. of the corresponding bis(sulfides) and bis(sulfones) in yields of 70-96%. The photochem. reaction of iron complexes I (R = H, alkyl, etc.; X = O, S; Cp = cyclopentadienyl) gave the sulfides II (same R, X)
Triplet energy transfers in electrostatic host-guest assemblies of unsaturated organometallic cluster cations and carboxylate-containing porphyrin pigments.
No full textThe unsaturated cyclic [M3(dppm)3(CO)](2+) clusters (M = Pt, Pd; dppm = Ph2PCH2PPh2; such as PF6(-) salt) exhibit a cavity formed by the six dppm-phenyl groups placed like a picket fence above the unsaturated triangular M3 dicationic center. Electrostatic interactions of the M(3+) units inside this cavity with the carboxylate anion RCO2(-) [R = tetraphenylporphyrinatozinc(II), ZnTPP; p-phenyltritolylporphyrinatozinc(II), ZnTTPP; p-phenyltritolylporphyrinatopalladium(II), PdTTPP] form dyads for through-space triplet energy transfers. The binding constants are on the order of 20,000 M(-1) in all six cases (298 K). The energy diagram built upon absorption and emission spectra at 298 and 77 K places the [Pt3(dppm)3(CO)](2+) and [Pd3(dppm)3(CO)](2+) as triplet energy donors, respectively, with respect to the ZnTPPCO2(-), ZnTTPPCO2(-), and PdTTPPCO2(-) pigments, which act as acceptors. Evidence for energy transfer is provided by the transient absorption spectra at 298 K, where triplet-triplet absorption bands of the metalloporphyrin chromophores are depicted at all time (at 298 K) with total absence of the charge-separated state in the nanosecond to microsecond time scale. Rates for energy transfer (ranging in the 10(4) s(-1) time scale) are extracted from the emission lifetimes of the [Pt3(dppm)3(CO)](2+) donor in the free chromophore and the host-guest assemblies. The emission intensity of [Pd3(dppm)3(CO)](2+) is too weak to measure its spectrum and emission lifetime in the presence of the strongly luminescent metalloporphyrin-containing materials. For the [Pd3(dppm)3(CO)](2+)...metalloporphyrin dyads, evidence for fluorescence and phosphorescence lifetime quenching of the porphyrin chromophore at 298 K is provided. These quenchings, exhibiting rates of 10(4) (triplet) and 10(8) s(-1) (singlet), are attributed to a photoinduced electron transfer from the metalloporphyrin to the cluster due to the low reduction potential.Source type: Electronic(1
Mental health of tourism employees post COVID-19 pandemic: a test of antecedents and moderators
No full textMany people are experiencing a lack of confidence in the security of their employment
due to the COVID-19 pandemic, particularly employees in the tourism sector, which has caused
adverse effects on their mental health. These adverse effects involve the management of stress,
anxiety and depression, that may arise from the demands of the industry. However, few studies have
explored how insecurity in the workplace and financial pressure from families affects mental health
and can intervene in these relationships. In this study, the aim was to investigate job insecurity as
an antecedent of employees’ mental health and family financial pressures as a moderator using a
sample of 475 hotel and travel industry employees. The theoretical background of the study was built
upon the theories of resource conservation and effort–reward imbalance. The participants completed
an online survey that measured job insecurity, family financial pressure, depression, anxiety, and
stress. The collected data were subjected to PLS-SEM data analysis. The findings of this study reveal
that job insecurity had a significant influence on depression, anxiety, and stress among tourism
employees, and family financial pressure worsened the negative consequences of job insecurity on
mental health. This research highlights the significance of addressing the mental health of employees
in the tourism sector after the COVID-19 pandemic, as well as the crucial role played by family
financial pressures. The findings of this study highlight the importance of addressing job insecurity in
the tourism industry and its impact on employees’ mental health. This could involve implementing
policies and practices that enhance job security, such as providing more stable work schedules,
better benefits packages, and greater opportunities for professional development. The results also
underscore the need to take into account the role of family financial pressure in moderating the
impact of job insecurity on mental health. Practitioners and policymakers in the tourism industry
should consider ways to alleviate financial pressure on employees and their families, such as offering
assistance programs, flexible work arrangements, and supportive company policies
Iron cyclopentadienyl mediated 2-alkyl-2-arylphenylsulfonylacetonitrile synthesis.
No full textA unique route to the synthesis of 2-alkyl-2-arylphenylsulfonylacetonitriles via the nucleophilic arom. substitution (SNAr) of (chloroarene)cyclopentadienyliron complexes with 2-alkyl phenylsulfonylacetonitriles was studied. Reactions of chloroarene complexes with 2-alkyl phenylsulfonylacetonitrile in the presence of K2CO3 in DMF at room temp. gave I (R1 = H, o-, m-, p-Me; R2 = Et, Bu) in good yields. The use of alkylated phenylsulfonylacetonitriles as nucleophiles in the reactions with the p-dichlorobenzene complex gave I (R1 = CR2(CN)(SO2Ph), R2 = Et, Bu). Photolytic demetalation provided an efficient route to the liberation of the arylated phenylsulfonylacetonitriles
Properties of the [M(dppm)2M']2+ building blocks (M, M' = Pd or Pt): site selectivity, emission features, and frontier orbital analysis.
No full textThe homodinuclear [ClM(μ-dppm)2MCl] complexes 1 (M = Pd) and 2 (M = Pt) react with RNC ligands (R = Ph, xylyl, p-tolyl, p-C6H4iPr) to provide the A-frame [ClPd(μ-dppm)2(μ-C:N-R)PdCl] (R = Ph (5a), xylyl (5b)), [ClPt(μ-dppm)2(μ-C:N-R)PtCl] (R = p-tolyl (4a); p-C6H4iPr (4b)), and the d9-d9 M2-bonded [ClPt(μ-dppm)2Pt(CN-R)]Cl (R = xylyl (3a); p-C6H4iPr (3b)) complexes. The heterodinuclear [XPd(μ-dppm)2PtX] complexes 6a (X = Cl) and 6b (X = I) react with RNC (R = o-anisyl) to form the A-frame [XPd(μ-dppm)2(μ-C:N-R)PtX] (X = Cl (9); I (10a)) and M2-bonded [ClPt(μ-dppm)2Pt(CN-R)]Cl (10b) complexes. The dangling ligand-contg. complex [ClPd(μ-dppm)2Pt(η1-dppm:O)](BF4) (7) reacts with xylyl-NC stoichiometrically to produce the dicationic salt [(xylyl-NC)Pd(μ-dppm)2Pt(η1-dppm:O)](BF4)2 (8). Parameters ruling the coordination site terminal vs. bridging are discussed. The precursor 10a reacts with RNC (R = o-anisyl, tBu) to form the heterobimetallic bis(isonitrile) [IPd(μ-dppm)2(μ-C:N-o-anisyl)Pt(CN-R)]I complexes 11b and 12, resp., demonstrating the site selectivity of the second CNR ligand coordination, Pd vs. Pt. The x-ray structures of 11b and 12 were obtained. Complex 12 is the first example of an A-frame system of the Ni-triad bearing two different isocyanide ligands. Several d9-d9 terminal and d8-d8 A-frame homo- and heterodinuclear complexes in 2-MeTHF at 77 K were studied by UV-visible and luminescence spectroscopy. Assignments for the lowest energy absorption and emission bands are made from d. functional theory and time-dependent d. functional theory computations. [on SciFinder(R)
Mental Health of Tourism Employees Post COVID-19 Pandemic: A Test of Antecedents and Moderators
No full textMany people are experiencing a lack of confidence in the security of their employment due to the COVID-19 pandemic, particularly employees in the tourism sector, which has caused adverse effects on their mental health. These adverse effects involve the management of stress, anxiety and depression, that may arise from the demands of the industry. However, few studies have explored how insecurity in the workplace and financial pressure from families affects mental health and can intervene in these relationships. In this study, the aim was to investigate job insecurity as an antecedent of employees’ mental health and family financial pressures as a moderator using a sample of 475 hotel and travel industry employees. The theoretical background of the study was built upon the theories of resource conservation and effort–reward imbalance. The participants completed an online survey that measured job insecurity, family financial pressure, depression, anxiety, and stress. The collected data were subjected to PLS-SEM data analysis. The findings of this study reveal that job insecurity had a significant influence on depression, anxiety, and stress among tourism employees, and family financial pressure worsened the negative consequences of job insecurity on mental health. This research highlights the significance of addressing the mental health of employees in the tourism sector after the COVID-19 pandemic, as well as the crucial role played by family financial pressures. The findings of this study highlight the importance of addressing job insecurity in the tourism industry and its impact on employees’ mental health. This could involve implementing policies and practices that enhance job security, such as providing more stable work schedules, better benefits packages, and greater opportunities for professional development. The results also underscore the need to take into account the role of family financial pressure in moderating the impact of job insecurity on mental health. Practitioners and policymakers in the tourism industry should consider ways to alleviate financial pressure on employees and their families, such as offering assistance programs, flexible work arrangements, and supportive company policies
Amid the COVID-19 Pandemic, Unethical Behavior in the Name of the Company: The Role of Job Insecurity, Job Embeddedness, and Turnover Intention
No full textThe worldwide economic crisis initiated by the COVID-19 pandemic certainly altered the perception of regular job insecurity dimensions and brought these to the ultimate level. When employees feel insecure, they may decide to participate in unethical behavior in the name of the company to avoid layoff and become retained employees. This study investigated the relationship between job insecurity and unethical organizational behavior through the mediating role of job embeddedness and turnover intention. A total of 685 employees working in five- and four-star hotels and category A travel agents participated in this study. Data were analyzed using structural equation modeling. Job embeddedness and turnover intention were found to be partially mediated by the impact of job insecurity on unethical organizational behavior. Theoretical and practical implications were identified and discussed
Amid COVID-19 Pandemic, Entrepreneurial Resilience and Creative Performance with the Mediating Role of Institutional Orientation: A Quantitative Investigation Using Structural Equation Modeling
No full textAs a result of the spread of the coronavirus (COVID-19), thousands of small companies around the world have been severely disrupted. Many business professionals, particularly entrepreneurs, suffer from the unprecedented magnitude of the lockdown of social activities, which is combined with limits on individual mobility. This study investigates the resilience of entrepreneurs—which is characterized by hardiness, resourcefulness, and optimism—as well as the relationship between resilience and creative performance. Additionally, the mediating role of institutional orientation is investigated in order to highlight how contextual factors influence this relationship. Using a quantitative study approach and structural equation modeling data analysis technique, 390 entrepreneurs were investigated, and the analyzed data demonstrate that entrepreneurs’ ability to persevere in the face of adversity is strongly related to their ability to innovate, with institutional orientation serving as a partial mediating variable. Implications and future research opportunities are also explored in the paper
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