We report the synthesis of au nique cubic metalorganic framework (MOF), Fe-HHTP-MOF,c omprising hexahydroxytriphenylene (HHTP) supertetrahedral units and Fe III ions,a rranged in ad iamond topology.T he MOF is synthesized under solvothermal conditions,y ielding ah ighly crystalline,deep black powder,with crystallites of 300-500 nm sizea nd tetrahedral morphology.N itrogen sorption analysis indicates ahighly porous material with as urface area exceeding 1400 m 2 g À1 .F urthermore,F e-HHTP-MOF shows broadband absorption from 475 up to 1900 nm with excellent absorption capability of 98.5 %o ft he incoming light over the visible spectral region. Electrical conductivity measurements of pressed pellets reveal ahigh intrinsic electrical conductivity of up to 10 À3 Scm À1 .Q uantum mechanical calculations predict Fe-HHTP-MOF to be an efficient electron conductor,exhibiting continuous charge-carrier pathwayst hroughout the structure.

We report the synthesis of a unique cubic metal–organic framework (MOF), Fe‐HHTP‐MOF, comprising hexahydroxytriphenylene (HHTP) supertetrahedral units and FeIII ions, arranged in a diamond topology. The MOF is synthesized under solvothermal conditions, yielding a highly crystalline, deep black powder, with crystallites of 300–500 nm size and tetrahedral morphology. Nitrogen sorption analysis indicates a highly porous material with a surface area exceeding 1400 m2 g−1. Furthermore, Fe‐HHTP‐MOF shows broadband absorption from 475 up to 1900 nm with excellent absorption capability of 98.5 % of the incoming light over the visible spectral region. Electrical conductivity measurements of pressed pellets reveal a high intrinsic electrical conductivity of up to 10−3 S cm−1. Quantum mechanical calculations predict Fe‐HHTP‐MOF to be an efficient electron conductor, exhibiting continuous charge‐carrier pathways throughout the structure.

An LED sphere radiator (LED-SR) was constructed to improve the accuracy in spectral radiance factor measurements performed with the robot-based gonioreflectometer at PTB. Its properties with respect to the spectral range and coverage, the temporal stability, and the homogeneity of the radiation field are presented. Two types of matte ceramic reflection standards were used for spectral radiance factor validation measurements comparing the standardly used halogen sphere radiator (Halogen-SR) and the LED-SR. Due to its designed spectral range at the border between the visible and the UV-A spectral range, the LED-SR is well suited for many applications in diffuse reflectometry. Its use for absolute radiance factor measurements and investigations of the fluorescence properties of diffuse reflecting samples is shown. Reliable polarization-resolved measurements at wavelengths below 430 nm could be carried out with PTB’s gonioreflectometer for the first time due to the beneficial signal-to-noise ratio of the LED-SR.

This paper describes a detailed derivation of the uncertainty budget for measurements of the absolute spectral radiance factor with PTB’s gonioreflectometers. The measurement uncertainty is determined according to the “Guide to the expression of uncertainty in measurement (GUM)” provided by the Bureau International des Poids et Mesures. To give an insight, the uncertainty analysis is applied on measurements of three ceramic samples. The influence of different systematic and statistical sources of uncertainty and their contributions are discussed in detail. For wavelengths larger than 450 nm the total measurement uncertainty is dominated by systematic contributions. Towards UVA the major contribution is caused by statistical effects, which are mainly due to the decreasing power of the radiation source used. We present an approach capable to reduce this contribution for the VIS/UVA-transition spectral range by means of a specially designed LED-based sphere radiation source.

Fe‐HHTP‐MOF , a unique cubic metal–organic framework (MOF) comprising hexahydroxytriphenylene (HHTP) supertetrahedral units and FeIII ions arranged in a diamond topology, is reported by Thomas Bein, Dana D. Medina et al. in their Research Article on page 18065. Fe‐HHTP‐MOF is a highly crystalline, porous, and deep black material featuring high electrical conductivity.