Ronald L. Musselman

Immobilization of MP-11 into a Mesoporous Metal–Organic Framework, MP-11@mesoMOF: A New Platform for Enzymatic Catalysis

Microperoxidase-11 has for the first time been successfully immobilized into a mesoporous metal-organic framework (MOF) consisting of nanoscopic cages and it demonstrates superior enzymatic catalysis performances compared to its mesoporous silica counterpart.

Ground- and excited-state properties of Zn(II) tetrakis(4-tetramethylpyridyl) pophyrin specifically encapsulated within a Zn(II) HKUST metal-organic framework.

We have examined the photophysical properties of Zn(II) tetramethylpyridyl porphyrin (ZnT4MPyP) specifically encapsulated within the cubioctahedral cavities of a ZnHKUST metal- organic framework. The encapsulated ZnT4MPyP exhibits a Soret maxima at ∼458 nm that is bathochromically shifted relative to ZnT4PyP in ethanol solution (Soret maxima centered at 440 nm). The corresponding emission spectra of the encapsulated porphyrin exhibit resolvable bands centered at 636 and 677 nm relative to a single broad emission band of the ZnT4MPyP in ethanol solution centered at 636 nm with a shoulder situated near ∼660 nm. The fluorescence lifetime of the encapsulated porphyrin is also perturbed relative to that of the free porphyrin in solution (1.88 ns for the encapsulated porphyrin relative to 1.2 ns in solution). These results are consistent with the ZnT4MPyP being in a more constrained environment in which the peripheral pyridyl groups have restricted rotational motion. The ZnT4MPyP triplet lifetime is also affected by encapsulation, giving rise to a longer lifetime (τ ≈ 3.3 ms) relative to that for the free porphyrin in solution (τ ≈ 1 ms). The triplet-state results indicate that nonplanar vibrational modes of the porphyrin leading to intersystem crossing are retained by encapsulation of the porphyrin but that either the density of vibrational states or the specific nonplanar modes coupling the singlet and triplet states may be perturbed, resulting in the longer observed lifetime.

Charge and spin transfer and optical properties in conducting porphyrin compounds

Anisotropic materials made from stacked macrocycles have potential applications as organic conductors and nonlinear optical materials. Using self‐consistent‐field local density theory, we have been exploring the ground and excited state electronic structures of metal substituted tetraazaporphyrins, phthalocyanines, and tetrabenzoporphyrins. The calculated and measured polarized optical absorption peaks are in satisfactory agreement. The theoretical dipole oscillator strengths provide absolute intensities for verification of transition assignments, which are helpful for identifying low‐lying states and excitation mechanisms.

Single crystal morphology of the copper acetate dimers Cu2(CH3COO)4·2H2O and Cu2(CH3COO)4pz

The morphology of two forms of copper acetate, Cu2(CH3COOH)4·2H2O (CuOAcH2O) grown from an acetic acidethanol solution and Cu2(CH3COOH)4pz (CuOAcpz) grown from aqueous solution, has been determined. The principal faces of CuOAcH2O are (101), (011), (211), (110), and (112); those for CuOAcpz are (010), (111), (111), and (111).

A Chemical Literature Management System Using ENDNOTE

A personal literature database can be a significant help in organizing references for planning, interpreting, and reporting research. This is especially useful if means are available for extracting listings from comprehensive databases and if selected references can be incorporated automatically into manuscripts. We report an integrated database system in operation in our laboratory. While the system we describe is for a chemistry database and certain of the sources discussed are specifically chemistry sources the system is applicable to any discipline. Our system is Macintosh based but the software involved is also available for IBM compatible personal computers. The current core of the system is the database management and bibliography generation program, EndNote Plus from Niles and Associates, with input through Current Contents and Chemical Abstracts.

Humidity control device for a semiclosed environment

A portable device that easily maintains a desired humidity at room temperature ranging from 50% to 95% in a small, closed environment is described. This device permits extended x‐ray and spectroscopic analysis of crystals that require a humidified environment by passing a stream of air over heated water. An electronic controller coupled with a humidity sensor provides feedback and control.

Polarized single-crystal specular reflectance spectra of (TMTSF)2ClO4 in the visible and ultraviolet

Abstract Single-crystal specular reflectance spectra of three polarizations of (TMTSF) 2 ClO 4 in the visible and ultraviolet regions and their Kramers-Kronig-transformed absorption spectra are reported. Earlier reports of visible transitions are confirmed with the addition of integrated intensities, and several new transitions are reported quantitatively in the ultraviolet.

High-efficiency infrared lamp housing

A high-efficiency lamp housing for illumination of monochromators especially for use in the infrared is described. The unit is capable of collecting approximately 70% of the output of the central filament coils of a 150 W lamp for a fast monochromator while occupying only 250 cm2 of bench space, giving a sixfold improvement in throughput intensity over a conventional lamp housing.