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Access to Formally Ni(I) States in a Heterobimetallic NiZn System.

ABSTRACT: Heterobimetallic NiZn complexes featuring metal centers in distinct coordination environments have been synthesized using diimine-dioxime ligands as binucleating scaffolds. A tetramethylfuran-containing ligand derivative enables a stable one-electron-reduced S = 1/2 species to be accessed using Cp2Co as a chemical reductant. The resulting pseudo-square planar complex exhibits spectroscopic and crystallographic characteristics of a ligand-centered radical bound to a Ni(II) center. Upon coordination of a ?-acidic ligand such as PPh3, however, a five-coordinate Ni(I) metalloradical is formed. The electronic structures of these reduced species provide insight into the subtle effects of ligand structure on the potential and reversibility of the NiII/I couple for complexes of redox-active tetraazamacrocycles.

SUBMITTER: Uyeda C

PROVIDER: S-EPMC4300139 | biostudies-literature | 2013

REPOSITORIES: biostudies-literature

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Access to Formally Ni(I) States in a Heterobimetallic NiZn System.

Uyeda Christopher C Peters Jonas C JC

Chemical science 20130101 1

Heterobimetallic NiZn complexes featuring metal centers in distinct coordination environments have been synthesized using diimine-dioxime ligands as binucleating scaffolds. A tetramethylfuran-containing ligand derivative enables a stable one-electron-reduced <i>S</i> = 1/2 species to be accessed using Cp<sub>2</sub>Co as a chemical reductant. The resulting pseudo-square planar complex exhibits spectroscopic and crystallographic characteristics of a ligand-centered radical bound to a Ni(II) cente ...[more]

PMID: 25614786

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Project description:BackgroundMothers in low-income settings who work in agricultural employment are challenged to meet breastfeeding (BF) recommendations. Recent legislation in Kenya mandates maternity leave and workplace supports, yet the relation of these benefits with BF practices is poorly understood.ObjectivesWe evaluated the associations with workplace-provided BF supports and BF practices among formally employed mothers in Kenya. The availability of supports was hypothesized to be associated with a higher prevalence and greater odds of exclusive breastfeeding (EBF).MethodsWe conducted repeated cross-sectional surveys among formally employed mothers at 1-4 d and 6, 14, and 36 wk (to estimate 24 wk) postpartum in Naivasha, Kenya. We used logistic regression adjusted for maternal age, education, physical burden of work, HIV status, and income to evaluate associations between workplace supports and EBF practices.ResultsAmong formally employed mothers (n = 564), those who used onsite workplace childcare were more likely to practice EBF than those who used community- or home-based childcare at both 6 wk (95.7% compared with 82.4%, P = 0.030) and 14 wk (60.6% compared with 22.2%, P < 0.001; adjusted OR: 5.11; 95% CI: 2.3, 11.7). Likewise, at 14 wk among mothers who currently used daycare centers, a higher proportion of mothers who visited daycare centers at or near workplaces practiced EBF (70.0%) than of those not visiting daycare centers (34.7%, P = 0.005). EBF prevalence was higher among mothers with access to workplace private lactation spaces than among mothers without such spaces (84.6% compared with 55.6%, P = 0.037), and among mothers who lived in workplace housing than those without onsite housing (adjusted OR: 2.06, 95% CI: 1.25, 3.41).ConclusionsFormally employed mothers in Kenya who have access to and use workplace-provided BF supports were more likely to practice EBF than mothers who lacked these supports. As the Kenya Health Act is implemented, lactation rooms, onsite housing and daycare, and transportation to visit children can all support BF and EBF among employed mothers.

Dataset Information

Access to Formally Ni(I) States in a Heterobimetallic NiZn System.

Publications

Access to Formally Ni(I) States in a Heterobimetallic NiZn System.

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