Steplike Response Behavior of a New Vapochromic Platinum Complex Observed with Simultaneous Acoustic Wave Sensor and Optical Reflectance Measurements
Bibliographic record
Abstract
We report the synthesis and characterization of a new vapochromic platinum compound, [Pt(CN−cyclododecyl) 4 ][Pt(CN) 4 ]. This compound is stable to 120 °C and reversibly sorbs three water molecules per formula unit at room temperature when it is exposed to 100% relative humidity. Dramatic changes in absorption and emission spectra are observed in response to water uptake. The vapor response characteristics of this material were further investigated by simultaneous optical reflectance and quartz crystal microbalance (QCM) measurements, using water as the test vapor. The sensing film on the QCM consisted of a mixture of the solid vapochromic powder dispersed in a hydrophobic vapor permeable polymer. The polymer was incorporated as a binder to adhere the sensing material to the QCM surface. Reflectance measurements were taken from the film on the QCM surface using a bifurcated fiber optic bundle incorporated into the flow cell. The vapor sorption characteristics of the vapochromic compound as determined by the QCM were closely correlated with the observed spectral changes. In addition, an unexpected steplike response with increasing water vapor concentration was observed, with little water vapor uptake at low concentrations, followed by a large water uptake with corresponding spectral changes, and then little change with further increases in water vapor concentration. Water vapor uptake as measured by the QCM is in agreement with the bulk gravimetric measurements. The response behavior is rapid (minutes) and reversible. The distinctly nonlinear, steplike response is interpreted as a reversible transition from a nonhydrated form of [Pt(CN−cyclododecyl) 4 ][Pt(CN) 4 ] to a hydrated form with three water molecules per formula unit.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".