The metaphorical problem : realism and anti-realism in the philosophy of metaphor

This thesis is concerned with the meaning of metaphors. In particular, it examines a contemporary dispute in the philosophy of language, primarily comprising critical responses to Donald Davidson’s seminal work in the area, which focuses on the question of whether metaphorical utterances, qua metaphors, ought to receive distinctive semantic evaluations. I treat this debate as an instance of a more general form of philosophical dispute, which has been explored in some detail in recent work on the nature of realism and anti-realism. The thesis has five chapters. In the first chapter, I outline, motivate and evaluate two contrasting approaches to realism, proposed by Michael Devitt and Crispin Wright. I argue that neither is wholly satisfactory, but that a modified version of Wright’s approach is likely to be most fruitful in the philosophy of metaphor. In the second chapter, I examine the character of Davidson’s anti-realism, concluding that he is best thought of as an error-theorist about metaphorical meaning. I go on to set out a unified Davidsonian argument for semantic and pragmatic anti-realism about metaphor, and offer a sustained discussion and partial defence of the six premises that such an argument proceeds from. My third chapter outlines a series of common objectives to Davidson’s views, and argues that error-theorists have the resources to address many of these criticisms in a fairly plausible manner. In the fourth chapter, I go on to investigate the realist standing of metaphorical meaning in more detail. I examine the open-endedness of metaphor in the light of Wright’s response-dependent theory of intention, and argue that this approach offers a novel response to certain anti-realist concerns. The fifth chapter concerns the relationship between metaphor and non-conceptual content. I argue that thinking of metaphorical meanings as non-conceptual entails that the non-propositional and limitless character of metaphor does not pose a fatal objection to a pragmatic realist account, contra Davidson. I apply my suggested account to two test cases: metaphors that describe one’s emotional state, and religious metaphors, and argue that in each case, thinking of the metaphors as expressing non-conceptual contents is potentially suggestive and helpful. In that chapter, I also examine the possibility of an robustly realist approach to metaphorical meanings, modelled on the epistemicist approach to vagueness set out in recent work by Timothy Williamson. I demonstrate how the dominant objection to this account can be partially defused, and go on to examine the final standing of the dispute between realist and anti-realist

The metaphorical problem : realism and anti-realism in the philosophy of metaphor

This thesis is concerned with the meaning of metaphors. In particular, it examines a contemporary dispute in the philosophy of language, primarily comprising critical responses to Donald Davidson’s seminal work in the area, which focuses on the question of whether metaphorical utterances, qua metaphors, ought to receive distinctive semantic evaluations. I treat this debate as an instance of a more general form of philosophical dispute, which has been explored in some detail in recent work on the nature of realism and anti-realism. The thesis has five chapters. In the first chapter, I outline, motivate and evaluate two contrasting approaches to realism, proposed by Michael Devitt and Crispin Wright. I argue that neither is wholly satisfactory, but that a modified version of Wright’s approach is likely to be most fruitful in the philosophy of metaphor. In the second chapter, I examine the character of Davidson’s anti-realism, concluding that he is best thought of as an error-theorist about metaphorical meaning. I go on to set out a unified Davidsonian argument for semantic and pragmatic anti-realism about metaphor, and offer a sustained discussion and partial defence of the six premises that such an argument proceeds from. My third chapter outlines a series of common objectives to Davidson’s views, and argues that error-theorists have the resources to address many of these criticisms in a fairly plausible manner. In the fourth chapter, I go on to investigate the realist standing of metaphorical meaning in more detail. I examine the open-endedness of metaphor in the light of Wright’s response-dependent theory of intention, and argue that this approach offers a novel response to certain anti-realist concerns. The fifth chapter concerns the relationship between metaphor and non-conceptual content. I argue that thinking of metaphorical meanings as non-conceptual entails that the non-propositional and limitless character of metaphor does not pose a fatal objection to a pragmatic realist account, contra Davidson. I apply my suggested account to two test cases: metaphors that describe one’s emotional state, and religious metaphors, and argue that in each case, thinking of the metaphors as expressing non-conceptual contents is potentially suggestive and helpful. In that chapter, I also examine the possibility of an robustly realist approach to metaphorical meanings, modelled on the epistemicist approach to vagueness set out in recent work by Timothy Williamson. I demonstrate how the dominant objection to this account can be partially defused, and go on to examine the final standing of the dispute between realist and anti-realist.EThOS - Electronic Theses Online ServiceGBUnited Kingdo

Chemical Reaction Dynamics at Surfaces

Contains reports on three research projects.Joint Services Electronics Program (Contract DAAL03-86-K-0002)Joint Services Electronics Program (Contract DAAL03-89-C-0001)National Science Foundation (Grant CHE 85-08734)MIT Energy Laboratory - Synthetic Fuels CenterPetroleum Research Fund (Contract 19014-AC5

Chemical Reaction Dynamics at Surfaces

Contains reports on four research projects.Center for Materials Science and EngineeringCamille and Henry Dreyfus FoundationNational Science Foundation (Grant CHE82-06422)Research CorporationNational Science Foundation (CHE85-08734)Synthetic Fuels Center of the Energy Laboratory at M.I.T.Center for Materials Science and EngineeringMonsant

Chemical Reaction Dynamics at Surfaces

Contains reports on six research projects.Joint Services Electronics Program Contract DAAL03-89-C-0001MIT Energy Laboratory - Synthetic Fuels CenterNational Science Foundation Grant CHE 85-08734Petroleum Research Fund Contract 19014-AC

Suppressing Dimer Formation by Increasing Conformational Freedom in Multi-Carbazole Thermally Activated Delayed Fluorescence Emitters

Ideal emitters for organic light-emitting diodes (OLEDs) are capable of efficiently harvesting non-emissive triplet states, have high colour stabilities, and possess high photoluminescence quantum yields (PLQYs). Maintaining colour stability and PLQY is particularly challenging for multi-carbazole thermally activated delayed fluorescence (TADF) materials that form persistent dimers due to intermolecular interactions of their extended aromatic systems (with altered electronic states). Addressing this challenge, three new emitters are presented, which demonstrate that, somewhat counterintuitively, sterically uncrowded acceptor units can suppress these undesirable interactions. They do so by allowing the surrounding carbazole donors to be arranged with lower dihedral angles, which in turn limits their availability for dimerization. A new pyrazine-centered emitter 4CzPyz is contrasted directly with the cyanopyridine and terephthalonitrile analogues, 4CzCNPy and 4CzTPN respectively. The pyrazine derivative demonstrates enhanced colour stability in the solid-state compared to the cyanopyridine and terephthalonitrile acceptors, which we assign to its absence of intermolecular face-to-face aromatic interactions. This suppression of dimer formation is shared by two cyanopyrazine emitters 2Cz2CNPyz and 3CzCNPyz, each of which feature reduced steric pressure and flatter Cz-Pyz dihedral angles than non-heterocyclic analogues. Flatter dihedral angles consequently lead to C–H bonds of the Cz donors extending outwards at angles that prevent the stacking required for dimerization. This expanded understanding of dimer formation in TADF materials will guide future efforts to maintain colour stability in higher performance TADF materials by curbing the prevalence of face-to-face aromatic interactions

Modulation of Charge Transfer by N-Alkylation to Control Photoluminescence Energy and Quantum Yield

Charge transfer in organic fluorophores is a fundamental photophysical process that can be either beneficial, e.g., facilitating thermally activated delayed fluorescence, or detrimetnal, e.g., mediating emission quenching. N-Alkylation is shown to provide straightforward synthetic control of the charge transfer, emission energy and quantum yield of amine chromophores. We demonstrate this concept using quinine as a model. N-Alkylation causes changes in its emission that mirror those caused by changes in pH (i.e., protonation). Unlike protonation, however, alkylation of quinine’s two N sites is performed in a stepwise manner to give kinetically stable species. This kinetic stability allows us to isolate and characterize an N-alkylated analog of an ‘unnatural’ protonation state that is quaternized selectively at the less basic site, which is inaccessible using acid. These materials expose (i) the through-space charge-transfer excited state of quinine and (ii) the associated loss pathway, while (iii) developing a simple salt that outperforms quinine sulfate as a quantum yield standard. This N-alkylation approach can be applied broadly in the discovery of emissive materials by tuning charge-transfer states