title: Coordination polymers and isomerism; a study using silver(I) and a ∏-stacked ligand

authors: Caradoc-Davies, Paula L.

subjects: chemistry

abstract: The ligand 2,5-bis(2-pyridylmethylsulfanylmethyl)pyrazine (L) was prepared by the base coupling of 2-(sulfanylmethyl)pyridine and 2,5-bis(chloromethyl)pyrazine. This new ligand was treated with AgClO₄ in a 1   1 metal-to-ligand ratio and with AgNO₃in a 2   1 metal-to-ligand ratio to give coordination polymers. The crystal structures of {[Ag(L)]ClO₄}∞ ( 1) and {[Ag₂(L)](NO₃)₂}∞ ( 2) were determined. The Ag(I) ions in the one-dimensional polymeric chains of 1 adopted square-pyramidal geometries with the pyridine and pyrazine N donors coordinated in an extremely bent fashion. The structure of 2 revealed two isomeric polymer chains in the one crystal forming a single supramolecular array. The isomeric polymers differed in the donor atoms about the Ag(I) ions and in the arrangement of adjacent ligands along the chain. A feature of both structures was that L adopted a three-layer ∏-stacked arrangement.

text: Coordination polymers and isomerism; a study using silver(I) and a ∏-stacked ligand The ligand 2,5-bis(2-pyridylmethylsulfanylmethyl)pyrazine (L) was prepared by the base coupling of 2-(sulfanylmethyl)pyridine and 2,5-bis(chloromethyl)pyrazine. This new ligand was treated with AgClO₄ in a 1   1 metal-to-ligand ratio and with AgNO₃in a 2   1 metal-to-ligand ratio to give coordination polymers. The crystal structures of {[Ag(L)]ClO₄}∞ ( 1) and {[Ag₂(L)](NO₃)₂}∞ ( 2) were determined. The Ag(I) ions in the one-dimensional polymeric chains of 1 adopted square-pyramidal geometries with the pyridine and pyrazine N donors coordinated in an extremely bent fashion. The structure of 2 revealed two isomeric polymer chains in the one crystal forming a single supramolecular array. The isomeric polymers differed in the donor atoms about the Ag(I) ions and in the arrangement of adjacent ligands along the chain. A feature of both structures was that L adopted a three-layer ∏-stacked arrangement.

year: 2001

title: Biography of an ERP: Tracing the fabrication of a virtual object

authors: Lowe, Alan

subjects: ERP (enterprise resource planning)

abstract: This paper provides an account of the way Enterprise Resource Planning (ERP) systems change over time. These changes are conceptualised as a biographical accumulation that gives the specific ERP technology its present character, attributes and historicity. The paper presents empirics from the implementations of an ERP package within a single Australasian organisation. Changes to the ERP take place as a result of imperatives which arise during the implementations. Our research and evidence then extends to a different time and place where the new release of the ERP software was being ‘sold’ to client firms in the UK. We theorise our research through a lens based on ideas from ANT ( actor network theory) and the concept of biography. The paper seeks to contribute an additional theorization for ANT studies that places the focus on the technological object and frees it from the ties of the implementation setting. We contrast this approach with Dechow and Mouritsen’s (2005) path dependency. The research illustrates the opportunistic and contested fabrications of a technological object and emphasizes the stability as well as the fluidity of its techno-logic.

text: Biography of an ERP: Tracing the fabrication of a virtual object This paper provides an account of the way Enterprise Resource Planning (ERP) systems change over time. These changes are conceptualised as a biographical accumulation that gives the specific ERP technology its present character, attributes and historicity. The paper presents empirics from the implementations of an ERP package within a single Australasian organisation. Changes to the ERP take place as a result of imperatives which arise during the implementations. Our research and evidence then extends to a different time and place where the new release of the ERP software was being ‘sold’ to client firms in the UK. We theorise our research through a lens based on ideas from ANT ( actor network theory) and the concept of biography. The paper seeks to contribute an additional theorization for ANT studies that places the focus on the technological object and frees it from the ties of the implementation setting. We contrast this approach with Dechow and Mouritsen’s (2005) path dependency. The research illustrates the opportunistic and contested fabrications of a technological object and emphasizes the stability as well as the fluidity of its techno-logic.

year: 2007-05

title: Tiakina te Pā Harakeke: Māori Childrearing practices within a context of whānau ora.

authors: Pihama, Leonie

abstract: ‘Tiakina Te Pā Harakeke’ was developed to support the investigation and identification of  Kaupapa Māori	approaches to Māori childrearing and parenting. The project investigates how we can draw upon such frameworks to support intervention in the area of child abuse and child neglect within our whānau. ‘Tiakina Te Pā Harakeke’ is a research project that brings to the fore	the successful values and practices of childrearing that have been held within whānau, hapū and iwi for many generations. It is an exploration and sharing of knowledge that supported the belief held by our tūpuna that our tamariki and mokopuna are treasured parts of whānau, hapū and iwi, as is expressed in the saying	‘he taonga te mokopuna’.

text: Tiakina te Pā Harakeke: Māori Childrearing practices within a context of whānau ora. ‘Tiakina Te Pā Harakeke’ was developed to support the investigation and identification of  Kaupapa Māori	approaches to Māori childrearing and parenting. The project investigates how we can draw upon such frameworks to support intervention in the area of child abuse and child neglect within our whānau. ‘Tiakina Te Pā Harakeke’ is a research project that brings to the fore	the successful values and practices of childrearing that have been held within whānau, hapū and iwi for many generations. It is an exploration and sharing of knowledge that supported the belief held by our tūpuna that our tamariki and mokopuna are treasured parts of whānau, hapū and iwi, as is expressed in the saying	‘he taonga te mokopuna’.

year: 2014