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Munster, IN, United States

Kraft P.E.,Munster High School | Laduca R.L.,Michigan State University
Acta Crystallographica Section E: Structure Reports Online | Year: 2012

In the polymeric title compound, [Cu3(C7H 5O2)6(C11H9N 3O)2] n , square-planar-coordinated CuII ions on crystallographic inversion centres are bound by two monodentate benzoate anions. The resulting [Cu(benzoate)]2 fragments are joined to centrosymmetic [Cu2(benzoate)4] paddlewheel clusters [Cu⋯Cu = 2.6331 (5) Å] by means of bridging N-(pyridin-4-yl)nicotinamide (4-pna) ligands [dihedral angle between the aromatic rings = 39.18 (12)°], thereby forming [Cu3(benzoate)6(4-pna)2] n coordination-polymer chains that are arranged parallel to the [30-1] crystal direction. These polymeric chains are anchored into supra-molecular layers by N-H⋯O hydrogen bonding between neighboring 4-pna ligands. These layers aggregate by crystal packing forces to afford the crystal structure of the title compound.

Tran P.,Internal Medicine Residency Program Mercy Medical Center | Shah S.R.,Munster High School | Latif F.,Oklahoma City University | Nguyen T.,St Mary Medical Center
Current Cardiology Reviews | Year: 2015

During percutaneous coronary interventions (PCI) for chronic total occlusion (CTO), prolonged procedures increase the risk of excessive radiation exposure. These situations harbor a major concern to protect patients and personnel in the cardiac interventional laboratory (CCL). Important questions regarding radiation safety for interventional cardiologists performing PCI for CTO lesions are discussed and concrete applications are suggested. © 2015 Bentham Science Publishers.

O'Donovan M.E.,Michigan State University | Kraft P.E.,Munster High School | Mizzi J.E.,Michigan State University | Laduca R.L.,Michigan State University
Zeitschrift fur Anorganische und Allgemeine Chemie | Year: 2014

Hydrothermal reactions of cadmium nitrate and 4-pyridylnicotinamide (4-pna) with a 5-substituted isophthalic acid derivative afforded four coordination polymers, whose structural chemistry depends on the nature of the substituent. The crystalline phases produced using bromo and carboxylic acid substituents, [Cd(Brip)(4-pna)]n (1) (Brip = 5-bromoisophthalate) and [Cd(Hbtc)(4-pna)]n (2) (btc = 1,3,5-benzenetricarboxylate), have similar structural chemistry. They both exhibit anti-syn {Cd2(OCO)2} dimeric units that serve as 6-connected nodes for 3D twofold interpenetrated 41263 pcu networks, which are constructed by the linkage of [Cd2(carboxylate)2]n ribbons by tethering 4-pna ligands. An in situ amide hydrolysis of the 4-pna precursor was observed when a bulkier substituent (tert-butyl or methoxy) was utilized. The resulting nicotinate (nic) anions were incorporated into {[Cd2(tbip)(nic)2(H2O)4]·H2O}n (3) (tbip = 5-tert-butylisophthalate) and [Cd2(meoip)(nic)2(H2O)2]n (4) (meoip = 5-methoxyisophthalate) which both display an overall (6,3) hexagonal grid layered topology. However, 3 shows isolated cadmium atoms while 4 manifests {Cd2(OCO)2} anti-syn bridged dimeric clusters. Luminescent and thermal properties of these materials are also reported. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Wilson J.A.,Michigan State University | Kraft P.E.,Munster High School | LaDuca R.L.,Michigan State University
Inorganica Chimica Acta | Year: 2013

Hydrothermal reaction of cadmium nitrate, potassium hydrogen phthalate (KHphth), and either 4-pyridylnicotinamide (4-pna) or 3-pyridylisonicotinamide (3-pina) afforded two new luminescent coordination polymers with similar structural components but different dimensionality. {[Cd2(phth) 2(4-pna)(H2O)]·0.25H2O}n (1, phth = phthalate) manifests [Cd4(phth)4(H 2O)2] ribbons based on tetranuclear clusters, connected to two others by pairs of tethering 4-pna ligands to afford 4-connected 2D (4,4) layers. [Cd2(phth)2(3-pina)(H2O)]n (2) has similar tetranuclear clusters and [Cd4(phth) 4(H2O)2] ribbons, which are linked to four others by 3-pina tethers to construct a 6-connected 3D 4126 3 pcu network. Subtle differences in phth binding and bridging mode, along with changes in coordination environment, serve to influence the dimensionality of the resulting coordination polymer. Thermal decomposition behavior is also discussed. © 2013 Elsevier B.V.

Kraft P.E.,Munster High School | Weingartz L.E.,Michigan State University | LaDuca R.L.,Michigan State University
Inorganica Chimica Acta | Year: 2015

Abstract The dimensionality and structure of divalent zinc coordination polymers containing the dipyridylamide ligand 3-pyridylnicotinamide (3-pna) can be adjusted by varying the 5-position substituent on an isopthalate moiety. Two new coordination polymer solids were obtained by hydrothermal self-assembly and structurally characterized via single-crystal X-ray diffraction. Using the unsubstituted isophthalate (ip) ligand, [Zn(ip)(3-pna)]n (1) was obtained. This material exhibits {Zn2(OCO)2} dimer-based [Zn(ip)]n chains linked into (426)(42678) 3,5L2 topology layers by anti conformation 3-pna ligands. By employing 5-methylisophthalate (mip), the coordination polymer {[Zn(mip)(3-pna)]·2H2O}n (2) was obtained; these feature syn conformation 3-pna ligands. Compound 2 shows a rarely encountered 4-connected 1-D ribbon motif with 33425 topology, encapsulating infinite single-file water molecule chains within incipient tubular channels. Thermal and luminescent properties of these materials are also discussed. © 2015 Elsevier B.V.

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